Thanks in advance! What you're seeing is a hybrid of tabulature and sheet music notation. Below the tab are the stems of the notes, indicating how long they are played, i.e. the note value. Start with the wiki page and come back if you have any questions.
What do lines under tabs mean?
Guitar Tablature explained
Tab appears underneath conventional music notation as six horizontal lines that represent the strings of the guitar, from the sixth (thick) string at the bottom to the first (thin) string at the top. On these lines, numbers represent the frets where you should place your fingers.
What do chords above tabs mean?
Chords above tab means that it need to playing notes from this chord. You need to place your hand in the specified chord position on the fretboard and play the notes by tab. It is convenient to understand the sound of a melody in the context of a certain chord, harmony.
What are tabs in music?
Tablature (or tabulature, or tab for short) is a form of musical notation indicating instrument fingering rather than musical pitches. Tablature is common for fretted stringed instruments such as the lute, vihuela, or guitar, as well as many free reed aerophones such as the harmonica.