>>2920863
if they're offering classes you'll get most mileage out of a tig class. since it's the hardest process to get good at, but easiest to start. you'll learn the basics of welding and a good core fundamentals(puddle, weld size, heat, etc).

Stick welding is the best process to learn welding with, but you won't use it much for auto except emergency repairs or outdoor building shit like trailers etc. Mig welding is much simpler after learning stick or tig welding, but not the other way.

most body guys all use mig, since it's fastest for tack and spot welding and you can do it without a hood on fixing a panel in. also easier to use a whip one handed than trying to get a torch and filler in some places. most auto guys don't care what welds look like since they grind it all down, or just want it done quick(mig is quickest process).

exhaust work, aluminum and fancy shit is all tig. though both are perfectly doable with mig.

both processes require more expensive welders(though much cheaper nowadays) and shielding gas.

Depending on cost of the class, I'd just say buy
>a decent 180amp+ DC tig welder($400)
>bottle of argon($400)+regulator($30)+hose($15)
>1/16th S6 Filler Wire ($20)
>gloves($20)[leather], welding helmet($50-100)[tefawue], jacket or heavy cotton long sleeve shirt($40)
>4 1/2" angle grinder($75) [bosch]
>scrap steel or whatever
>hours watching youtube

If you have access to 220v you'll have a better time. Else you can still practice on thin 1/8th steel. And a tig welder will let you stick weld as well, learning more. Tig welding doesn't (usually) produce any sparks or smoke, so don't need a huge dedicated area to do it.