Rhythm

Listen. 

Try while listening to yourself.

Try again.

When you get it, keep doing that.

One of the best ways to learn rhythm, in my opinion anyway which isn't worth a whole lot, is to learn how to count.  The old, 1 2 3 4, 1& 2& 3& 4&, 1e&a 2e&a 3e&a 4e&a - so forth and so on. 

Also, you need to learn to recognize the "feel" of songs and the rhythm style.  Obviously reggae will be different from country which will be different from a classical waltz which will be different from a 6/8 folk song. 

A waltz has a nice easy DA duh duh DA duh duh feel.  A reggea has two rhythms.  The main melody is pretty standard folk 1, 2, 3, 4 by the rhythm guitar and bass mostly emphasize the off beat 1 AND 2 AND 3 AND 4 AND.  The 1 2 3 4 are silent but the ANDs are strongly emphasized.    Carribean music does much the same but without such a strong emphasis and it has a kind of quick triplet thing on the 2 and 4 beats.  1 and 2 da da 3 and 4 da da.  And it's a shuffle.  Each note of the triplet isn't exactly the same like they teach you in class.  You really have to FEEL caribbean music to play it.  You can't really count it, though I tried to give an example here of doing what I said can't be done because I'm just that goofy.

Good luck.

I guess my suggestion is to listen to a mix of different styles of music, learn the "sound" and feel of each, and then grab your guitar while listening to them and try to get the rhythm without worrying at first about the chords. 

Oh.  Zydeco.  Try explaining the difference between Zydeco, Caribbean, and Reggae and you'll go nuts.  But, each has a very distinctive sound.