That, than and what mean the same?

That, than and what mean the same?
 

sometimes i have a littles problems with those words but i´m confussed yet.
that, than and what mean: que in spanish right .
I know, what: it´s used only to make questions but sometimes go in middlen of the sense. but i need some exmple to make clear my problems.
I will thank you

Here are a few examples:

No veo lo que ves.
= I don't see what you're seeing.
Dime lo que haces.
= Tell me what you're doing.

Mi cuaderno es más grueso que el tuyo.
= My notebook is thicker than yours.
Mejor es dar que recibir.
= It's better to give than to receive. (Giving is better than receiving.)

Sé que pronto el sol va a ponerse.
= I know (that) the sun will set soon. *Notice that 'that' is not needed in English.
No me digas que ella no te quiere.
= Don't tell me (that) she doesn't love you.
Quiero que te vayas.
= I want you to leave. *Verbs of volition in English - notice no subjunctive or 'that'
Es importante que sepas.
= It's important for you to know. *No subjunctive
= It's important (that) you know. *Subjunctive form (much less common)


Toma nota que no habrá clase mañana.
= Take note that there won't be class tomorrow.

¡Qué divertido!
= How fun!
¿Qué es eso?
= What is that?

Eso no es rojo.
= That isn't red.
Dame ese lapiz.
= Give me that pencil.
Aquí hay una carta chica y otra más grande. En ésa, el autor no puso su dirección. En aquélla, sí.
= Here is a small letter and a larger one. In the latter, the author didn't write his address. In the former, he did.

Rusty's explanations are great, so I'll just make a few corrections to your English. (Espero no te moleste :))

a littles problems :bad: => unos pequeños problemas => some little problems :good:
i´m confussed yet :bad: => estoy confundido todavía => I'm still confused :good:

thank you David............................
i didn`t know that.