Comment by bombcar

Washers and dryers are probably one of the best places to start - if you have the ability to bring them home, you can find them laying literally for free.

80% of the problems are a single part or loose connector, and they’re big enough and common enough that they’re easy to work on and have lots of YouTube help available.

Then you can progress to working on the control boards themselves instead of just swapping them.

If you have a garage and will do this, I highly recommend the harbor freight lift table: https://www.harborfreight.com/500-lb-capacity-hydraulic-tabl...

Once you get into it you can actually make some coin, free washer, $10-50 in parts, sell for $100 when working.