Dota hero types

In Dota, heroes are divided into three types based on their primary attribute: Strength, Agility and Intelligence.

Here is a brief explanation about what the main differences between the three are:

Dota strength heroes have more hp than other heroes and can take a lot of damage, for this reason they are used to initiate fights and in game are known as "tanks".

Dota agility heroes have fast attack speed and can do lots of damage. They become really strong and can kill heroes unassisted late into the game.

Dota intelligence heroes have lots of spells and depend on having plenty of mana throughout the game. They have disabling spells and strong nuking spells which are very helpful in early game.

It is usually a good idea to have at least one of each in the game. If you are just starting to play Dota then you should probably pick a ranged agility hero since they can stay far back and aren't very complicated to use. They can take care of themselves later on.

Mortred, a very strong carry

A "carry" in Dota is a hero (usually agility, but not always) that becomes strong later in the game and can take out any enemy hero or heroes on their own.