Dont use webmail, the purpose of a browser is to execute foreign code of unnown sources -> they can serve you any website they would like
dont use Email, it's all plain text on the servers (unless you insist on using pgp, yet still a lot of metadata is plain text)
dont use centralised communication ie. Signal. You're creating societal habits that wont be easily changeable if you start to distrust them. Matrix and IRC etc. dont need a phone either
https://piped.video/watch?v=iH626CXyNtE