Walkthroughs:
The very first thing you should do is start with the included walkthrough in the steam files. You can find the walkthrough located here:

C:\Program Files (x86)\Steam\steamapps\common\X Beyond the Frontier

It contains the English walkthrough. If you can read German I would recommend looking at the walkthrough by Henker here:

Link[www.gamefaqs.com]

It seems to be the most complete and even if you can't read German it can still come in handy at times if you take the time to look it over.

Videos:
I also found these series of videos to be very helpful:

Link


Maps:

Link[gamefaqs.gamespot.com]

Link[www.nappefugl.dk]


Keyboard Controls:

Link[itsradiofreezerg.blogspot.com]

These Steam links were broken and I couldn't find the original discussions I used but I'm leaving them just in case.
The forums has a list of all the controls that can't be found in game. Not all the controls are listed in the first post so going over it is advised. Things like docking and the ecliptic projector are under spoiler tags on the second page:

Link

Audio/Codec Issues:

Some new discussions about sound issues that might be of help
Link
Link
Link[forum.egosoft.com]

This is an old Steam discussion again as above
Link