For my Mongoose 2E campaign, I made my own custom GM screen, with only the stuff I found myself needing on a regular basis. It's 3 landscape pages, designed to be put in a customizable GM screen.
You can download a PDF copy, and the original Affinity files I created it with, here: https://polyhedralnonsense.com/2025/10/09/a-custom-gm-screen-for-traveller/
If you’re not averse to videos, Seth Skorkowsky has the gold standard for rule overviews:
https://youtube.com/playlist?list=PL25p5gPY6qKVUg6ys5N1oRlsBI7DTByyI
First video is a very nice introduction and “what to expect” kind of thing.