If you're just starting out have a look at this diagram and fretboard orientation video. I'm working my way through questions but I'm moving roughly in order of level/difficulty. For you guys with more experience don't forget that many of the videos are already released unlisted and can be accessed via the "link libraries" in each video description. All videos have timestamp/chapters. You can use these timestamps to treat these videos as mini courses. Take notes, return to specific places, skip to points of study etc... make the most of the information.