Tab tells you where to put a finger, not what note it makes: six lines for the strings (the high string on top), a number for the fret. To read it you need the map from (string, fret) to pitch — and that depends on the tuning. Each fret is one half step up from the open string. Explore the fretboard below, then read a tab line onto the staff.
A one-string-per-line tab and the notes it spells. Read it yourself, then reveal & hear it.