Verbs that end in "se" are reflexive. Reflexive verbs are verbs that describe things that you do to yourself. For example, llamar means, "to call, to name." However, llamarse means, "to call oneself." Another example would be cruzar, which means, "to cross." But cruzarse can mean, "to cross paths, to meet." Hope that helped!

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Llamarse: To call oneself (ex: I call myself María which is equivalent to My name is María…)

Cruzar: To cross (a street)

Cruzarse:To cross a body part over itself (cross your arms)

When se is added at the end, it means it is a reflexive verb and is something that you do to yourself.

Bañarse (to bathe oneself)

Llamar is to call. Such as calling someone on the telephone. Llamo mi tia- I call my aunt

Llamarse means to call but is addressed to a person’s given name. Me Llamo Rico- My name is Rico.

The verb llamarse is usually associated with telling someone your name. It is conjugated like any regular ar verb-o, as, a, amos, an. However we have to use the reflexive pronouns at the beginning of the verb. The reflexive pronouns are- me, te, se, nos, se.

Me llamo
Te llamas
Se llamas
Nos llamamos
Se llaman

Same thing with cruzar. Cruzar means to cross. Like to cross the street. Cruzas la calle?- Did you cross the street?

Cruzarse means you cross something. For example Me cruzo la mano. I cross my hands.