I’m both experienced and know jack shit because there is just too much to learn. I just started using it (1998ish) to make cool looking UIs. Its been my daily driver for 15 years now.
You will never learn it all. Over time you may become more familiar with the terminal or you may not. Doesn’t matter. You do you.
Its pretty easy to test drive. Grab a distros “Live CD” version, put in on a thumb drive, reboot and play around. This wont be persistent. When you’re ready, install it on an external SSD. Play around some more now that your edits will be persistent. You’ll mess up. Take notes. Start again once you’ve hosed your system.
There is anonymity and pseudonymity.
Do you need your opsec to be resistant to state-level actors (oppressive regime, censorship, illegal activities)? Well then you need to make sure you don’t introduce anything that will deanonomize you.
Are you trying to be resistant to mass data collection efforts used for profit? Being on the pseudonymity spectrum is a good step.
Dealing with the latter is like dealing with a bully. Make it not worth their time. They just want to put you in bucket X so they can estimate the most likely way to influence you for reason Y. Pseudonymity is about having multiple aliases that get put into different buckets so their privacy invasive efforts are less effective.