I've had mine for just a little over a year, & I love it ! it really IS a workhorse ! I've sewed cottons to outdoor wp canvas on it and no problems -
There is a flip stitch guide handy at the top of the machine. READ your manual well ! (I made a copy to make notes in, have it in a binder) Try out stitches and make a stitch sample "book". The Janome website has good info, you can download the manual, see accessories and video too.
Lots of 6600 owners here, great tips. There are a bunch of YouTube videos also. Go play and enjoy ! :)