It's great to see you take an interest! The best way to learn is probably by watching a TV broadcast if you get the chance. The TV broadcast has two announcers, one to give the play-by-play, filling you in on what's going on. The second announcer is the analyst (aka. color commentator). They give statistics, talk strategy, and give deeper insights. These are often former players.
Tomorrow is the College Football National Championship game. That's the college football equivalent of what the World Cup is in soccer. If you can watch the TV broadcast of it, that would be a great place to start!
NFL UK also put out a Beginner's Guide to American Football on YouTube. It's just over a minute long but does a great job of going over the basics. It might be worth checking out the channel to see if there's more like it.