Super Budget Build

I am basically going for a super budget build. I don't really want to play any demanding games on it but rather I might run some basic video editing or photoshop on it . Also I am gonna use it for machine learning. Not some heavy training just running some local models. I have thought about buying a used office pc and upgrading it but after doing a little bit of reseatch I have realised that most of the office pcs are from the floppy disks era so not a viable option. Any ideas ?