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So I removed hostapd with
sudo remove hostapd
but the folder
/etc/hostapd
still exist but even when I use
sudo apt install hostapd
it won’t bring back
/etc/hostapd/hostapd.conf
or the other files in
/etc/hostapd
And therefore I can’t edit the file or activate hostapd
Edit: Output from sudo rm /etc/hostapd:
rm: cannot remove ‘/etc/hostapd’: Is a directory
The original version of your post referred to "the file in /etc", which is why I said to try sudo rm /etc/whatever-file-you-mean. To remove a directory with rm, you need to use -r or -d, see man rm. You really should be at least looking at the man pages of commands that are new to you when you first use them. This could save you the time and hassle of having to ask for help with relatively simple things.
Anyway, to remove a directory you can also use rmdir -- but it only works on empty directories. To make an educated guess, probably the reason the directory was not removed was because it contains configuration files that have been changed since they were installed; the point of that is so you do not loose config files you may want to use again. Generally re-installing will respect this, I think, but perhaps not in all cases (actually it sounds like that is what happened).
So the solution here is (if hostapd is still installed, sudo apt remove hostapd first):
sudo rm -r /etc/hostapd
From man rm:
-r, -R, --recursiveremove directories and their contents recursively
This means you could delete the entire root filesystem with rm -r /, so be careul with it.
sudo rm /etc/whatever-file-you-mean.