The correct video is a tricky request as there is no one correct video. The videos here were really helpful to me when I first started but I just found How to: Knit Increases
which shows several ways of increasing in one video making them easier to compare. I wanted and couldn't find this when I started! Which increase you use is up to you, you just don't want to leave holes. Pick the one you are most comfortable with and use that one, just be consistent.
There are other methods of increasing but you don't really need to be concerned about them just yet.
ETA: Knowing when to increase is terrific! A lot of new knitters really get stuck on where to place the increases evenly.