[adjective] + -ly
[subject] + [verb] + ([object]) + [adverb]
An adverb of manner says how someone does something. Most are an adjective with -ly: slow – slowly, quiet – quietly, careful – carefully.
An adjective describes a person or thing. An adverb describes an action.
After be, look, feel, sound, taste and smell, use the adjective.
The adverb of good is well. Fast, hard, late and early are the same as the adjective.
Hardly and lately are different words. Hardly means "almost not", and lately means "recently".
The adverb goes after the verb, or after the object if there is one. It doesn't go between the verb and the object.
Friendly, lovely and lonely are adjectives. For an action, say in a friendly way.