A verb is a word that carries out an action or a state of being. For example: Mary is a choir girl. Mary sings beautifully.

A direct object is a word(s) that receives the action. For example: Jackson kicks the ball.

An indirect object is a word(s) that receives the direct object. For example: Johnny gave Bill the cake.

An action verb is a verb that portrays a physical/mental action. For example: David thought about pie, OR, Brendon shouts at the floor.

A linking verb is a verb that represents a state of being. For example: Jimmy was sad.

A helping verb is a verb that assists the main verb. For example: I could eat this pie, OR, I have finished my painting.

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I've found that verbs in writing have become more important to me than adjectives, nouns, or any other part of speech.

For example, this:

     Their entire faces crinkle when they smile, like their sassy personality.

Is not as descriptive as this:

    Their noses, trimmed up in shape, are always seamed with the firm strings of a smile, and those strings also pleat their fawn eyes on their quest to vanquish the entirety of the two's faces with a jocular grin and a grain of sass to further their personalities.

Interesting verbs in this sentence: seamed (adjectival form of a verb), pleat, vanquish, trimmed (adjectival form of a verb)

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Hope this helped!