I'd recommend just watching other people's runs and trying to do what you see for yourself. If you're struggling, you can also join the Discord server and ask questions, there's a lot of people who are willing to help!
Scy, She was giving the advice for what NOT to do to avoid a softlock.
On that note, Another one to avoid doing is Rex Fury Astronaut on FMTTM (Fly Me to the Moon). The game will not let you continue past the second phase of the Rex fight and onto the falling to earth freefall section.