Hi everyone.
I was wondering how do you practice writing or if you even do it. I’m still a complete begginer, I’ve been learning a lot of vocab and grammar and I would like to write as it works for me when learning something. I just don’t know what to write. I usually take my lessons here at Bunpro, write the grammar explanation, some examples and that’s it. But I want to go further if you know what I mean. Thanks in advance.
I don’t really have a method in specific to give you. But I do have some simple advice.
Just remember that it doesn’t need to look perfect, or exactly like what you see on your device. Consider normal handwriting in English compared to text on a computer. Don’t overthink it when it doesn’t look perfect, as people will still know what you’re writing down.
Hope that helps lol
You should definitely be investing in kanji if you haven’t yet. You don’t have to go crazy with it, but try to learn 2-5 a day.
After you’ve learned hiragana/katakana and some kanji… just write. There’s no specific strategy. If you need some ideas, consider writing your own example sentences for the grammar points you learn (or new vocabulary/kanji), keep a short daily dictionary (maybe 2-3 sentences a day), or give yourself writing assignments (e.g. write your self-introduction, write about your family, write about your occupation, etc.).
Chat GPT has been helpful in reviewing my letters. You could probably use that and ask for feedback if you just want practice.
Also, https://bunpo-check.com/ has been a helpful tool as well.
This might be a scary recommendation for when you’re further along and feeling slightly more acclimated and comfortable with japanese (although you learn best when feeling uncomfortable and struggling), but worked for me and glad I did:
Go to a local japanese meetup and try to make a friend! If not available, there are services and apps to connect language learners, but I haven’t used them and unable to vouch for any.
It depends on what you want to write, but writing back and forth between a native speaker helps tremendously. The bunpo check linked above is really helpful in explaining changes and you can ask questions to clarify as well.
I learn Kanji with WaniKani and found an Anki deck to practice the handwriting (stroke order) of the kanji in WaniKani order.
I do 5 new kanji writings every day. My focus is on getting the stroke order right and keep the kanji readable.
As FreakazoidalPrism already mentioned: it doesn’t have to be perfect.
I want to add: Whatever you see on your screen is a “print font” most of the time and far from what people write with their hands. Just compare what you read here vs any handwritten text.
If you just want to practice writing but not output yet (= not forming own sentences)*, then you can also just copy sentences or paragraphs/pages from any source (websites, favorite novel, newspaper, whatnot). This has the benefit of even more “reviews” of what you learned and recognizing patterns, which will help you with your output later on.
For writing, I’d suggest to first learn the stroke order, though. You can do that either by practicing the kanji isolated or combined with other kanji or kana by writing words.
With that, even the craziest kanji become “easier”, since by then you know how to draw all the radicals the kanji is made of.
*I’d suggest to wait with output as a complete beginner (forming own sentences, neither spoken nor written). You already have so much to deal with and without knowing the vocab or grammar, you put so much more pressure on yourself that it might become too frustrating (or you learn something wrong and have to put in much more effort later on to correct that - speaking from experience with English).
I’d suggest you focus on getting input as much as possible - including parroting the pronunciation and practice handwriting of what you learned. All that is part of the input and helps you build up your vocab and understanding of grammar, which will be a good foundation when you start outputting.
But that’s just a suggestion. Everyone has their own learning strategy, of course. As long as you have fun and can keep your motivation, everything is ok. 
I’ve tried several methods over the years, and while you will get several suggestions, I will at least tell you what not to do from my personal experience.
-Don’t fill up a whole page with one Kanji:
I’ve been around for a while and even though it’s less common now, I used to know people who would print out kanji practice sheets and write one Kanji dozens, possibly hundreds of times in one sitting, only to forget it the next day. It’s better to space out that learning. maybe write it 10 times, and another 10 the next day and so on.
-Write, but don’t write too much
I used to copy entire sentences verbatim. I would, “punish” myself for not getting a vocab or Kanji right in flashcards by having to write it 5-10 times. This will prolong your study time as writing is very time consuming. There was a point and time where I spent half my study time writing when it would have been more beneficial to read instead.
I hope these give some perspective. Ultimately, it’s best to try several things and find out what works for you. Some people need to write to understand better, some may not need it at all. It depends on the individual.
When I first started learning Japanese, my friend gifted me a kanji notebook where I would practice writing kanji down. When I realized that I was actually fully committed to learning, I invested into an iPad (for convenience) and have been using a journaling app. I just do what I did in the journal, on the iPad; write the kanji, then the kunyomi in hiragana, and the onyomi in katakana.
Aside from Bunpro, I also use WaniKani for all my kanji grinding. Once I got to a new level, I would just enter all the new kanji, and practice writing them in my journaling app.
I’ve been doing it for a year now and imo, it helps me remember the readings and has been very good practice.
I’m not sure if you mean practice the physical skill of writing by hand or practice translating thoughts into written words.
For the former - when I’m reviewing anki flashcards I physically write my (production) answers by hand. Sometimes, especially when I first started, I use 原稿用紙. You can order a cheap notebook online or print the paper out yourself. I recommend the biggest squares you can find at first and then reducing the size as you get more comfortable - maybe start with 200 squares per page. From this page, you can just click on the one that you want and print it out.
For practicing writing as in the process of translating thoughts into words; my first go at learning Japanese when I was in middle school I kept a livejournal. I think BearBlog may be a good equivalent nowadays. I would just write about what ever I could; in the beginning that was sentences like わたしはあさごはんにパンをたべました。 But it gets easier and after a few months I could share some more abstract thinking and make music recommendations. I made some Japanese friends that would read my blog and offer words of encouragement and corrections.
These are some of the things I have done over the years:
When studying kanji / vocab I do try to write things from time to time
Copied a few sentences from textbooks.
When learning new grammar points, I would slightly change the sentence from Bunpro / textbook to something else in my notebook. eg 私はドラマが大好きです to 私は映画が大好きです
When I had lessons, I would ask the teachers if its possible to write something extra for them to check. After getting my essay back, I would re-write it with the notes made from the teacher.
I normally tried to just use the vocabulary that I already know. I only used the dictionary to double check some kanji. Just to practice different grammar points and see how they are used. As in I would select beforehand what grammar points, I wanted to use and adapt the essay to shove them in 
haha
Just 1 page, max two pages - ie max 10 sentences or so. I started with self introduction, what I was doing over the weekend, trips etc, leading to very mini stories - boy meets girl, boy goes on adventure etc
These days, I mainly copy a few sentences from light novels / manga in a journal that I keep about what I have read / watched. At one point, I tried to write reviews but I realized that it was all very similar - eg I liked the manga volume. The characters were interesting 