Here are a few great starting points for a bunch of advice videos for bike repair, maintenance, and even techniques.
Check out the how-to list here:
https://www.youtube.com/playlist?list=PLUdAMlZtaV11U9AtszkMh0bpRqM4dtlDC
Maintenance list here:
https://www.youtube.com/playlist?list=PLUdAMlZtaV1333Cy1QnIZwqDXj1q0Ooyy
Enjoy!