Go through the video Describing People in French and take notes on the different descriptive adjectives. There are examples of

Physical descriptions
Personality descriptions
Nationalities

Categorize your notes so they make sense to you. You also might want to make note of the adjective endings in a different color so they stand out. See notes below on French adjectives.

Useful Information about French Adjectives

In French, describing people can get a bit tricky. That is because describing adjectives must agree with the nouns that they modify. What does that mean? See the examples below.

Look at the following examples:

Marie est blonde. (Marie is blond-feminine singular)

Martin est blond. (Martin is blond-masculine singular)

Marie et Pauline sont blondes.

Marie et Martin sont blonds.

Notice the -e added to the word “blonde” because Marie is a girl. You are specifically saying that Marie is blond. If you were talking about two girls, you would add an -es. You would just add -s for either two boys, or a mixed group of boys and girls.

Now look at the next example:

Marie a les cheveux blonds. Marie has blond hair.

Martin a les cheveux blonds. Martin has blond hair.

In this case, the adjective blonds is agreeing with the word cheveux (hair), which is masculine plural. You are specifically talking about the hair that is blond so you need to add an -s. If the word was feminine plural, you would add -es.

Notice also the change in verb.
When you are talking about a person, you use the verb to be=etre. When talking about any other noun, you will use to have = avoir.

Marie is...Marie has…

Marin is...Martin has...