Speaking of which, stuff that frequently comes up in privacy related forums:
Differentiate between your professional accounts (it has your real name attached) and your non-professional ones (you use it to discuss pooping methods for example). Don’t mix them up. I know many will say “so what if people in the fediverse know where I live and how I poop, I got nothing to hide” a lot, but that’s how people got doxxed or swatted.
Even if you don’t feel the need to, it’s good to sit down and identify the potential threats given certain problems. Do you recycle passwords for email and social media accounts? What about banking? If a malicious coworker or an immature family member got access to your social media profile and posted reputation-damaging content, how bad can things get? Identify the outcomes you can mitigate or must prevent, and plan accordingly.
There is no “100%” when it comes to privacy. It’s a process, not an “all-or-nothing” switch. Beginners often ask if “program X and Y will protect me 100%”, and the answer usually boils down to “there isn’t a single magic pill”.
Privacy ≠ Security ≠ Anonymity. A VPN subscription can secure your connection (content secret in transit), but does not make you anonymous (sender known to middle node). You could leave an anonymous message (sender unknown) on a public forum, but the message itself isn’t private (content not secret). And so on.
Encryption is a useful tool, but don’t fall for the “military grade encryption” speech. They often mean “we just slapped whatever shit it came up with”, nothing extraordinary.
There are many more but I will stop for now. No, I am not in Guantanamo.