The types of Motherboards are:
- ATX
- mATX
- ITX
- mITX
When buying a case, find the tech specs of that case online (Amazon, NewEgg or official manufacturer) --> They will always tell you which motherboards are supported.
Generally, the types of cases you will find are:
- Full Cases (will support all types of motherboards)
- Mid Cases (will support all types of motherboards)
- Mini Cases or Campact Cases (will support only mATX, ITX, and mITX boards)
There's always exceptions and special cases, so always check specs online first.