The main type being the verbs ending in -re. Keep in mind that this type includes less than 20 verbs.
How to conjugate an -re verb?
Just like verbs ending in -er and -ir, remove the -re from the verb, leaving you with the stem ending in d-. Then add the endings to the stem. For -re verbs, the endings are -s -s -nothing-ons -ez -ent. Remember that for il, elle and on, there is no ending in this conjugation.

Entendre To hear
Je j’entends
Tu entends
Il entend
Elle entend
on  entend
Nous entendons
Vous entendez
ils  entendent
elles  entendent
Common verbs ending in -re:
Attendre To    wait
Correspondre  To     correspond
Confondre To     confuse
Défendre To    defend
Pendre To   hang
Rendre To return / To give back
Répondre To answer
Dépendre To depend
Tendre To stretch / To hold out
Descendre To go down / To descend
Entendre To hear
Tordre To twist
Étendre To extend / To spread out
Fondre To melt