THE SUFFIX -ÉRT

The basic meaning of -ért is: for, for the sake of

The same rules are valid for it as for the other suffixes. It is simply attached to a word and if that word ends with a or e, then those vowels become á, é:

alma-almáért, gereblye-gereblyéért

It also has personal forms:
értem – for me
érted – for you
érte – for him/her/it
értünk – for us
értetek – for you
értük – for them

And the polite forms are: önért, magáért, önökért, magukért

It can be intensified: énértem, teérted, őérte, etc. The forms for the polite forms are intensified in the speech: önért, magáért

Not to be confused with the verb ért, that is to understand!

(Azt) értem. – I understand (that).
(Ezt) értem tetted? – You did (this) for me?

Like always az, ez can take this suffix.

azért – for that
ezért – for this

Ezért also means: therefore, this is why
Azért also means: therefore, that is why

Examples:

A népemért bármit megteszek.
I do anything for my people.

A lány beesett a Dunába, ő meg beugrott érte.
The girl fell into the Danube and he jumped after her.

Csak érted tettem, amit tettem.
I only did for you what I did.

Értem te ne hazudj a tanárnak!
Don’t lie to the teacher for my sake.

Kettőkor érte megyek az állomásra.
I’m going to pick her up at the station at two.

Nem jött, ezért hazamentem, nem vártam tovább.
He didn’t come, so I went home. I didn’t wait any longer.

Beteg volt és ezért nem hívott fel.
She was ill and this is why she didn’t call me.