icloud

I reset some options to do with photos multiple times by accident on my iPhone, namely the reset of suggestions of people and pets. Will that have caused any problems? Both time in photos it had to find people and group them again. Is it okay to press / slide off and back on options in...

I want to keep all my photos and videos stored in iCloud but compress them Googling doesn't give any suggestions on how to do this so wondered if anyone here had a good idea? Thanks