Re: Samsung Galaxy Note 2
None of those. Just cuz you are using ram that isnt a bad thing. Ram uses the same amount of power regardless of whether programs are using or not.
If you want to see what apps are currently open. Hokd the home button, when the next screen appears you should see a list of open programs. Whatever program you want to close touch it and swipe to the right.
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Re: Samsung Galaxy Note 2
If you are new I would suggest getting a task killer app. Such as: [Only registered and activated users can see links. Click Here To Register...] You can set task kill control levels, Crazy kill + when screen off work well. You can also just open the app when you want to kill stuff and check/uncheck what to kill. I'm rooted, but my RAM barely ever goes below 1Gb.