Likes and dislikes

Use mögen with things you like. The singular forms change: ich mag, du magst and er/sie mag.

Use mögen for liking a thing, such as Musik. Use gern with an activity, such as Ich höre gern Musik. Möchte expresses a wish, which is different from a general like.

Nicht can negate a statement or a description. In these simple examples it follows the object, or comes directly before the adjective.

Ich mag Fußball nicht negates the liking. Der Film ist nicht gut negates gut. Kein instead negates a noun phrase with ein or an article-free noun.

Place nicht before the phrase you contrast. With a separable verb, nicht comes before the final prefix when it negates the action.

Nicht am Samstag, sondern am Sonntag contrasts days. Sondern means but rather after a negative statement. These are specific plans, not general dislikes.