For some reason, I typically start out finding a deal on system memory, followed by a deal on an SSD for booting and spinny HDD for storage. After that, I'm looking for an open box deal on a motherboard.
Which item do you normally buy first, and why?
Case, PSU, CPU cooler first, whenever I spot a deal. Because if something interrupts the build, these things are likely to not drop significantly in price or get behind the tech curve, and less likely to have some kind of compatibility issue.
COVID interrupted my build, and that was exactly what I was doing. I sat on those original parts for over a year until things looked better to proceed to the next step.
Then I bought CPU/MB/RAM/SSD ordered at the same time, so I could get a system up and running with all the parts together, and be in the easy return window for all these critical components.
Once I had the system up and running, then I could relax and look for a GPU, which I only got 6+ months later.