To get himself, herself, themselves, the l-words all become se. Easy to remember, since it is the start of self.
lo / la / los / las → se
And once again me, te and nos do not change: they already include myself, yourself, ourselves and each other.
Él se habla · Ella se habla · Les hablan (a different group, not themselves)
With nos hablamos, the more natural reading is we speak to each other.
Se is what was missing. Until now you could not say he stays, because that needs he remains himself.
¿Te quedas? · ¿No te quedas? · ¿Por qué no te quedas? · Yo me quedo · Nosotros nos quedamos · Tú te quedas
After a "to" form the little word attaches to the end and must still match the person.
Quiero quedarme · Quiere quedarse · Quieren quedarse · Ellos quieren quedarse · Ustedes quieren quedarse
Useful to know when you look a verb up. The dictionary lists quedar with its meanings (to remain, and others), and then a separate entry for quedarse, to stay.
Another meaning of quedar: me queda bien, it fits me well, it suits me.
Whenever se, lo, me, te or nos goes on the end of a "to" form, it is written joined on.
quedarse, quedarme, verte, one word each
With se available, the whole set opens up. Look at darse cuenta as a unit to see how to manipulate it.
Me doy cuenta · No me doy cuenta · Nos damos cuenta · No nos damos cuenta · Se da cuenta · Ella se da cuenta · Se dan cuenta · No se dan cuenta
Two slips the teacher catches in this track, both familiar.
Querer splits under stress: quiero, quiere, quieren.