OP, don't listen to these people. Trust me and RunningArt, lol.
Bands can be useful aids in training. You can slap bands around your bar while you squat to achieve exactly what archimedeslever is saying here, more stress at the top of the lift. But to be honest, that's something a beginner shouldn't worry about.
Learn to squat, learn to deadlift, then start learning to clean. If you have no idea where to start, find a coach, or get really good at learning from YouTube. Start very light for at least a few weeks to make sure your form is down before you get heavy.
"Functional strength" is a weird phrase that has become incredibly bastardized over the past decade and archimedeslever's definition above is, well, totally made up. I have, like, THE BOOK on "functional training", or at least it used to be. It's by Jimmy Radcliffe, head of Oregon's strength department, or at least he used to be. Most of it is classic stuff: squat, clean, jerk, throw, jump, ...
If you get too into the "functional training" rabbit hole you'll start finding charlatans trying to sell you snake oil. There's nothing wrong with mixing it up and doing creative exercises, but once someone starts saying "barbell bad!" you know you're in the looney house.
Plyos are good though. You can make plyometric gains in the weightroom (cleans, weighted jumps, box jumps, ...) or you can make them on the track/field (all kinds of skips, hops, bounds, short sprints, ...).