Press the goggles to your face while looking down, if they stay on for a couple of seconds, you are almost assured a good fit. If not, keep looking.

How do I keep my goggles from fogging? Anti-fog solution made by Speedo or TYR Lick the lens with your saliva Leave some water in the goggles that will splash around and keep them clear

Stephen Taylor is a triathlon and endurance coach.  While swimming is a pretty complicated exercise and you certainly can’t learn everything from a video, this is a pretty simple entry level swimming guide.  This covers breathing, balance, and stroke mechanics.