General is definitely a step up from Tech but its really not that bad if you already passed Tech. the extra theory stuff is mostly around things like propagation, some basic electronics, operating procedures for HF, and the regs around HF bands. hamstudy is still great for it, same deal, just more questions in the pool. for bands -- as a General you get big chunks of 40m, 20m, 15m, and 10m which honestly is plenty to get started on HF. 40m at night is where i'd point any new HF op first, you can work a ton of stations without needing great conditions or a fancy antenna. you dont get the phone portions of 17m and a few others until Extra but realistically General gets you enough to keep busy for years. i wouldnt stress about Extra right away, just get on HF and have fun first then decide if you want to push for it. one thing i'll say is dont skip understanding the electrical theory bits even loosely -- not because the exam is tricky but because it'll actually help you troubleshoot stuff once you have a rig running.