x means the horse had a spell of at least 3 months generally, some forms are less than 3 months but 3 months is the general way it goes.

0 means the horse finished 10th or worse or in some from guides last. e.g. if there was only 5 horses instead of putting in a 5 they put in a 0 meaning it finished last of 5 horses.

group 1 is the highest graded race your horse can race in. e.g. melbourne cup, caulfield cup, golden slipper to name a few.

group 2 is the 2nd highest

followed by group 3 then listed races. open handicaps. welters. class 6 down to class 1 and maidens for horses that have not won a race (except for hurdlers) but that might complicate things for you. lol.

then in some country races you have class a class b etc. again that probably wont interest you at this stage.

hope this helps you out

cheers

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LOve all sports.