Transitivity

Verbs can be classified as transitive and intransitive, according to whether or not they require a direct object: something that the action of the verb is done to.

Intransitive verbs do not have objects. These include to go, to come and most verbs of motion. for example: "I'm going", "She was talking", "The dog barked".

Transitive verbs require an object: "She loves her baby", "he loves her", "dogs chase cats" and "rain benefits crops".

Many verbs can be used both transitively and intransitively: "He was whistling" and "He was whistling a tune" are both possible; as are "she was running" and "she was running a race" (and "she was running the business" - but here the meaning is different).

Ditransitive verbs can have an indirect object in addition: "The King gave the hero some land". The indirect object is the thing or person onto or for whom the action of the verb is performed - indirectly.

For more, see the grammar course article, when it's written