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Each of the 6 horizontal lines of the Tabulature staff represents your 6 strings on your guitar. The bottom line of the TAB is your low E string, aka 6th string (Thickest one), and the next line above that one represents your A string aka 5th string, the next one is your D string aka 4th string, next is G, then B, and the top line of the TAB is your high e string (thinnest one). The numbers on the TAB indicate which fret to play on that string. A zero means that string is played open/not fretted. An X if it appears anywhere means that string is not played for that chord. If there is no number on the tab for a particular string it means it’s not plucked at all.
So a C-chord in TAB would be from bottom to top, X32010
A G-chord would be 320033
A D-chord would be XX0232