Welcome to the Elite Galaxy commander!
You've probably already found most of the resources listed below, nevertheless have a look at them and don't hesitate to ask questions here in the forum.
In-game help is available in the form of menu links to the Pilot's Handbook and the Codex (right-hand cockpit panel 1st tab).
For a very good beginner's guide see:
An in-depth beginner’s guide to Elite: Dangerous.
Tutorials covering all aspects of the game, many of them in the form of YouTube videos, are available from
ED Tutorials.
If you wonder what to do in the vast open world of Elite, the
Elite Dangerous Career Chart has all career options laid out for you.
There is a wealth of useful information available in these forums spread out over hundreds of threads. Thanks to commander
@Alec Turner you can access all of that information and more via a single thread:
Alec's best of the forum (and elsewhere) [v2].
Also check out the
inara.cz and
eddb.io websites with (almost) realtime info on practically everything in the game.
The
coriolis.io and
edsy.org websites let you design your ships before buying them.
And last but not least, the
Elite Dangerous Wiki contains extensive information on nearly all aspects of the game.
o7