Google keyboard (gboard) keeps crashing, won't go away
It's very easy - just follow the instructions below:

Open Settings/App Management/Gboard/Storage;

Then clear up the cache and you are good to go! If it does not work even after this step, you have to follow the exact same instructions but instead of clearing cache you clear data. That is a sure shot method to get it to work, but I do not recommend it before you clear cache as when you clear data your preferences are reset.