Depending on your location there might be day classes, but if you are somewhat remote then your best bet is buying a sewing machine, watching youtube and following along with some beginner patterns. Singer, brother, janome are decent brands with decently cheap entry level machines.

You can get cheaper second hand ones but that comes with a risk that the machine has a fault or needs something done to it that as a beginner might throw you off. Same deal with the very, very cheap machines some might work just fine, but theres a chance that it chews fabric or breaks threads and as a beginner it will be harder to tell if its the machine or you. So a cheapish branded one is a safer bet.

You could also start with hand sewing, its cheaper again. All you need is a needle and sone thread. But Id say its harder than using a machine and takes longer to finish projects. It would be fine if you wanted to start by mending small tears and fixing buttons. But really hand and machine sewing are two very different beasts.