People That Know About Plumbing In A Sink. I Need To Know What These Things Are Called (pics) And How To?

tighten them.
This first one I have always tightened with my hands but it always eventually starts leaking again. Do I just need someone stronger to do it or do I need an actual tool. http://i237.photobucket.com/albums/ff81/…
The next one I desperately need to know how to tighten. I don’t know if you can tell from the picture, but this is the underneath that is connected to the faucet. The whole faucet moves around when we turn the water on and off. What type of tool, and exactly HOW do I go about tightning this thing??http://i237.photobucket.com/albums/ff81/…
Thanks guys!

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