Diference between Tabs and Chords

Tab shows you where to put your fingers to play notes

ie in the example you put your finger on the second fret on the third string

you use it for playing laed guitar lines

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Chords are where you play three or more different notes at once - it can be shown using tab but most people find it easier to use a chord chart. A chord chart shows the name of the chord and the fingering

you may find a tutor book helpful. theres lots of good books for beginners.