I’m not new to linux but the GPL seems quite complicated and I couldn’t even tell you which GPL Redhat subscribe to without going to check.
RHEL may not be going ‘closed source’ but they are closing down the channels to access the code and will prosecute any customers who distribute the code.
Linux gives you freedom.
Freedom lets you break stuff.
If, like Windows or MacOSyou just use it as intended by official support, it should be fine. If you start just adding everything and anything from anyone you’re gonna break stuff.
Other stuff is made to be idiot proof, Linux is not.