We use reflexive verbs in Spanish when a person is also the object of the action.
Levantarse (To wake up)
Lavarse (To wash – yourself)
Prepararse (To get -yourself- ready)
We use reflexive to differentiate between passive and active actions. For example:
Me lavo = I wash (myself)
Different to non reflexive action: Lavo el coche = I wash the car
How to use them?
It is very simple, just need to conjugate the verb as a regular verb. For example: Lavar (Lavo, lavas, lava, lavamos, lavais, lavan) and add the reflexive pronouns like in the example below:
Me lavo = I wash
Te lavas = You wash (yourself)
Se lava = He/She/It washes (itself)
Nos lavamos = We wash (ourselves)
Os lavais = You wash (yourselves)
Se lavan = They wash (themselves)