As a rule of thumb, adjectives appear in front of nouns or after linking verbs (meaning: verbs you could replace with to be). The images below shows what that looks like:
In the first example, both quick and lazy are adjectives, and go in front of their noun. In the second picture, quick is still an adjective, but comes after the noun it describes, as well as the verb that comes after the noun. Both ways are correct.
Adverbs, as you can see, are more complicated:
The adverb quickly can appear in any of the places marked by the arrows. This is true for most adverbs, though there are rules and exceptions you won't have to learn for now. Just remember that they don't follow the same rules as adjectives.
Once you've studied this page, feel free to retake Exercise 1, or move on to Exercise 2A. Once you've completed that exercise, you may move on to Course 2B.