Cutting Baseboards

Anybody figure out the best way to cut baseboards so they fit neatly and tightly into 90 degree corners? I\\\'m a novice at this and I\\\'m having a hard time not so much cutting the miters, but making sure I\\\'m measuring correctly so the fit is tight.

Appreciate any advice.

Thanks

The reason noone answered you is probably the difference in the language.
The term 'baseboard' is not known here.
It is known as skirting board.
You should be sure the corners are exactly 90° as very few are.
You mitre the outside corners by cutting each piece exactly half of the corner angle.
This could be done either on a hand mitre saw or better on a sliding power mitre saw.

For internal angles you place one piece against the back wall then scribe the mating piece to fit.
Scribing is done by cutting at 45° then using a coping saw to cut along the angle so the blade follows the shape of the moulding.
If you mitred the internal corners the join will open with the wood movement over the seasons.
This doesnt happen with scribed joints.
The opposite applies to outside corners.
Wood movement will close the joint rather than open it so a mitre is the perfect choice.