HELP ME I want to beat KurdInEurope at Backgammon

I am tired of seeing KurdInEurope waving his winners cup in the air
I WANT TO WIN
QUESTION:
I have never played backgammon before I tried in on RBK
Sometimes I manage to beat the computer
BUT
I do NOT understand the scoring
Why do I sometime have a high score? And sometimes a low score?
How does the scoring work? ? ?

I WANT TO WIN

QUESTION:
I have never played backgammon before I tried in on RBK
Sometimes I manage to beat the computer
BUT
I do NOT understand the scoring
Why do I sometime have a high score? And sometimes a low score?
How does the scoring work? ? ?