yeah, sounds like you're talking more about backpacking, mountaineering involves getting above treeline most of the time and involves roping up for glacier travel, possible mixed climbing (climbing a pitch with both rock and ice on it), and having the knowledge to take care of a situation should it arise (such as crevasse rescue, etc.) There's alot of shit to know for sure, but once you get into it it's pretty easy to pick up on it, you just have to get experience. and mountaineering doesnt always have to include snow travel. i did the Upper Exum Ridge on the Grand Teton last summer, and that is a good example of alpine mountaineering, where you are climbing technical rock at altitude, using ropes, running belays, etc. And yeah, Rainier is 14,411- it'll be the biggest mountain for me, and it is pretty huge- the route we're doing is 11,500 feet of vertical for the entire route, pretty big- it'll kick my ass towards the top for sure.
Drop cliffs, not bombs
Make turns, not war