How do I know if the mobo i buy will fit into the case?

How do I know if the mobo i buy will fit into the case that I buy?
The just screw in right?So how will I know how far apart the screw holes are in the case and how will I know that te screw holes in the mobo are the same distance part as the screw holes ar in the case so mobo will screw in nicely?

I am geting sorta confused about tis and if anyone could enlighten me I would be greatly appreciative

Thank-you.

The screws are in a standard pattern at standard distances apart.

If you are buying a microATX case, you will need a microATX motherboard.

inside the case, you'll see holes like these, the hole distance tells you if your case is ATX/mATX compatible.
of course, you can ask when you go to buy, I'm sure they'll let you know.

Thanks for enlightening me guys I appreciate it.

Usually the case instruction book (or page) has pretty good information. Usually there are standoffs that the motherboard screws onto rather than just bolting it to the case . Each case is different though.

People, this is why the computing industry has standards..so you won't have to ask and wonder if it will fit. If you buy a case that follows one standard and a motherboard of the same standard, it will work.