Meaning, allow yourself to relax from the constant pressure of sounding smart or intelligent! Around others and especially around and to yourself. I've found myself in the habit of over-explaining myself in conversations that I am not confident in talking about just because I was under the impression that I needed to look and sound smart to others. Genuinely f**k that! Don't overcomplicate things because you feel the need to impress. Often, that just leads to self-hatred, feeling dumb trying to get on the level of whoever you're talking to, and inserting yourself into conversations that you are not educated on.
TLDR: It's okay to say that you don't know about something or aren't educated enough. And it's even more okay to simplify your opinion instead of talking out of ur ass.