I get very far by just keeping a set of folders for each piece of equipment in a git repo.
Pictures, etc, and sometimes the PDF manual if I bother.
The difficult part here is being consistent over time - making sure you mark down when you bought things, serial numbers, etc. a proper website/app will force you to do this, but there is flexibility in having whatever convention you like most
I get very far by just keeping a set of folders for each piece of equipment in a git repo.
Pictures, etc, and sometimes the PDF manual if I bother.
The difficult part here is being consistent over time - making sure you mark down when you bought things, serial numbers, etc. a proper website/app will force you to do this, but there is flexibility in having whatever convention you like most