7. Aid climbing skills: Some routes require knowing how to ascend a fixed rope, or how to pendulum on your rope across to the next section, so knowing how to aid climb and set up safe places to rest and belay from are essential. Learning how to use the most practical aids to help you get through a rough section of whatever adventure you're on, before your life depends on it, is a wise thing to do.
8. Rappelling and downclimbing: Not every pitch will be successful for you on the first go, and not every adventure is completed easily, so be prepared with a plan (and the skills) to retreat from single pitches or the whole route. Be comfortable with the skills of downclimbing and setting up a rappel anchor, and consider taking a class on emergency assists and rescues if possible. For most adventures, you'll want to know the best way to ‘bail' or abort the attempt in the event that something goes awry, as even the best planned projects can get borked halfway through.
9. Packing and hauling gear: An average El Cap climb takes about a week, so you'll need to think about what you're going to eat and drink during the climb and be prepared to pack and haul it efficiently with you. You'll also need to carry gear for spending the nights on the wall, plus safety and emergency gear and changes of clothing. For faster and stronger climbers, a backpack may be possible, but for longer ascents, having a big haul bag to pull up behind you at each pitch will work much better. So you'll also need to know how to place secure anchors and set up a haul system just for your gear. Getting good at packing and carrying the gear you need for your adventures will pay off big time when you're out and about, whether you're on a bike, a boat, or a BASE jump.