How To Check and Maximize Memory?

New Mac user here with a new Macbook.
Got the 80gb model and have 55gb's free. I recently downloaded a few things but didnt end up using them. such as applications, programs, etc. I simply dragged them to the trash can and hoped i would receive more memory. sometimes it works, other times not.
where can i check my memory and free up space by deleting some things i just dont need?
Any and all information would be useful. Thanks

I should re-specify that it is a two-finger tap on the tackpad, not two fingers on the trackpad and click the mouse button. Hold two fingers up, and tap the same two on the trackpad - that will give you the equivalent of a "right click."
To uninstall programs in OS X is VERY simple, you simply open your HD, go to Applications, find the installed application that you want to removes icon and drag it to the trash bin. It autmatically uninstalls very quickly. Nice huh?
Kev

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How To Check and Maximize Memory?

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