Quick answer
gustar = to be pleasing; covers like, from mild to strong.
encantar = to delight; already means "love it", so it takes no mucho.
In both, the thing liked is the subject: me gustan los libros, not yo gusto.
Side by side
Me gusta tu casa. / Me encanta tu casa.I like your house versus I love your house — same structure, different intensity.
Me gustan las películas francesas.The verb agrees with películas, not with me — plural thing, plural verb.
A mí me encanta, pero a él no le gusta.The a mí / a él part is only for emphasis or contrast; the me and le are obligatory.
Memory trick
Ask what is doing the pleasing. That thing is the subject and sets the verb ending; you only appear as me, te, le, nos, les.
Typical mistakes
Me encanta mucho este libro.
Me encanta este libro.
Encantar already contains the intensity, so mucho is redundant and sounds wrong. Use muchísimo with gustar instead.
Yo gusto el chocolate.
Me gusta el chocolate.
The chocolate is the subject, not you. Saying <i>yo gusto</i> means "I am pleasing to others".
Check yourself
Fill in: "A nosotros nos ___ los conciertos al aire libre."