The table saw is a simple woodworking machine, with few parts to keep it working properly. Here are the main points of inspection:

The rip fence, the blade and the miter gage slots on the table must all be parallel.

The tablesaw top should be perfectly flat.

The arbor should be true.

No need to explain everything, I have found a nice video that shows you the main points on how to maintain your tablesaw instead. Enjoy