What does it mean to "learn the scales" when learning to play the keyboard?

What does it mean to "learn the scales" when learning to play the keyboard? Does that mean learn to play do-re-me-fa.... starting at any key? if Im playing a song like "for hes a jolly good fellow" does that mean im playing in the f-scale? are the three most popular scales c, f and g?
OK from these first few answer I can see that im on the right track. Now how do I practice the scales? I have played in F and G...do I need to just get used to the fingering? Should I play songs I already know in a different scale to practice the fingering?

Yes, a scale is do-re-mi in any key. Look at the key signature (how many sharps or flats) to learn what key you are in. The key of F has one flat (Bb) so if your music for Jolly Good Fellow has one flat, you are in F. Scales are handy because you learn what sharps and flats go with which keys and learn the best fingerings to play in that key.
C, F, and G are very popular because they're three of the easiest ones to play.

Edit: All the scales I mentioned are major scales. If you feel you need to learn more, search the net or buy a book on music theory. Maybe your local community college offers a course in music theory you could take as well.

Free Gospel Keyboard Lessons

How can i learn how to play this on the keyboard?

i've pretty much taught myself how to play the keyboard by using memory and i can read music if i write down the letters of the notes and stuff. i learned how to play the right side of You Are the Moon by The Hush Sound well enough that i can play along with the song. i can do the left side, but only slowly so that i can find the chords. like i can't play along with the side. the only thing is, how can i learn to play them together? should i know each side really well and put them together or learn them at the same time? any tips?

I've been playing keyboard for years.
And I find the best way is to practice them slow together.
Don't try to splice them into one another, it won't work, at all.
If you can't do this, learn something slower and easier with both hands.
It's a hard barrier to break, beleive me, and lots of people have trouble with it.
Just practice, practice, practice.
xxx

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