So the day we moved into our new house, my in laws unloaded EVERYTHING my wife owns that's been sitting in her old bedroom at their house. Amongst other things, there was a Yamaha PSS80 keyboard. Now, this is NOT one of Yamaha's legendary 80s keyboards, but it will do the job for me to learn a few chords and start finding my way around melodies.

Without going for formal lessons ( I don't have the regular time or the budget), what's the best way or get started with learning? I'm content with playing keys as a backing instrument, not hung up on becoming a piano maestro