How to properly configure apache for the correct operation of various CMS?

Question

Apache HTTP Server

In general, the crux of the matter is this. There is VDS on digitalocean. There is a non-root user. This non-root user, that is, Me, who set up several virtual hosts, put several sites on different CMS (wordpress and opencart). WordPress installed normally (downloaded directly from the source via ssh), but then there were problems installing plugins. I had to manually change the permissions for some files (i.e. shamelessly expand. Opencart immediately during the pre-installation check said that it lacked access to certain files. Forced me to set the permissions to 777. But this is not quite normal? Maybe you need folder owners change? Or something else. Please tell me.