I learnt some welding techniques as part of practical skills at a polytechnic engineering degree. But have used it only infrequently since.
With a bit of practice and tuition, you can get reasonably competent in a few hours. But there are LOTs of different types of welding, for different materials, thicknesses, shapes and sizes. You may be able to bodge a few things after a few hours practice. You certainly won’t make a decent job of it. Yes, it takes a lot of practice to do well.
Aluminium forms an oxide shell in moments. It is a real pig to weld. And although there are stick solutions now, they’re even harder and more job specific than steel.
Welding is great for the right materials under the right circumstances. But you may also find it doesn’t help you nearly as much as you think. Thin wire, thin panels, and anything badly corroded, are also really hard to weld.
A gas torch and some silver solder might do the bbq. Still needs a bit of practice, but easier than arc.
Gryff