てはいけない - Grammar Discussion

Grammar Points
#21

In sentence 1 of this point - そこに入はいってはいけない。
I keep failing by inputting ては instead of っては. Could someone explain me, why is it っては in this specific sentence? Is this some conjugation rule of previous grammar point, and if so then could you guide me towards it, so I can read about it a bit more?

#22

When it says verb(て) it’s looking for the て form of the verb. 入る is a godan verb, not ichidan. So it’s て form is 入って

This point includes the て forms for all endings

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#23

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Is “desu” really used in this situation? It is not mentioned in the explanation nor in any of the example sentences.

I thought “naranai” made the sentence polite.