I have been thinking of getting a welder for some years but dont know much about them

Understand gas welders are best but the bottles cost £100 each to refill so too expensive - they used to make one with smaller bottles but they dont exist anymore?

I dont know the difference between an elextric welder and a MIG electric welder except that the MIG has a wire running through it - why I dont know. Do these perform differently in use or is one better than the other for welding certain things? Can you help me tell the difference??????

Aldi have a MIG welder on offer DC power output of 25amp to 130amp - is this good enough for most jobs??

The MIG wire seems expensive - how long does it last? what does it do? is it like the electrode in the elec welder? Says its cored with flux - doe that help the weld?

If anyone can offer any advice or point me in the right direction - would appreciate it - it may save me from paying out on the wrong thing??

HELP

Pete