sometimes I feel like there is stuff my character should know how to do that -I- don't know how to do
We see this a lot, actually. Even among veterans.
Whenever it is appropriate to just give an OOC answer when the question is asked OOCly, people do. Understand though that a lot of the time it is not appropriate because it really does involve IC information, situations, gear, capabilities, etc., before your character can be expected to 'learn' things. And, so, in this situation, 'find out IC', 'examine that thing', 'find a mentor' are the only appropriate ways to respond.
We tell players that the advanced-researcher PhD in their @history does not grant them any OOC advantage or shortcut to IC progress, and we tell them this more frequently than you might expect. Guess what, it also does not grant them any IC advantage or shortcut to OOC progress either (all players must learn the same way as all others, how the world works).
So, the best option is to not write a @history which would create the kind of character who "would" know stuff which you don't know ICly. The next-best option would be to make sure that both the @history and your own OOC understanding of your character contains some justification for why the character has this powerhouse background but came into the immigration gates feeble, stupid, disadvantaged, and incapable.
In all situations, it's also good advice to be sporting and not bent out of shape if your character can't be badass their first day, and not simply as a matter of having too little UE, but as a matter of not having OOC understanding of IC material you haven't been exposed to yet.
As was recently written in another thread, explicitly, all the UE in the world can still result in a total inability to actually use skills effectively. (The same idea has been expressed in many other BGBB threads many other times. Type "Not A Badass", WITH quotation marks, into the site search field above and see a couple of the more relevant topics.) Experiencing the relevant part of the world is still necessary. So is the roleplaying which earns you IC and OOC knowledge which you (by design) cannot get from 'examine' or a helpfile all the time. Making progress is a RP driver, and that's a good thing.
There didn't used to be a helpfile on this. As of five or six weeks ago, now there is: https://www.sindome.org/help/game/power-level/. This helpfile is fairly prominently referred to in the @newbie section on History (yes, 'read @newbie' remains important advice for many new players).
It might still be helpful to new players if this kind of material were presented more prominently or more convincingly. Maybe a practical version (what does this game-design reality mean to my immigrant RP?). Maybe a philosophical version (why is this part of game design in the first place?) Maybe a social version (How do I find and make the RP which will allow my character to learn most effectively?)
Anyone who'd like to draft additional material on this or really ANY subject is welcome to do so. Email proposals and drafts to firstname.lastname@example.org. Helpfile text, @tutorial scripts, whatever you can think of. Thanks!