First, the meaning is different.
1. Very good means: very good.
2. Very good means: very healthy.
Second, the usage is different.
1. Very easy to use: good as an attribute in a sentence means "good, happy". Good is an uncountable noun when it means "moral things are good" and an uncountable noun when it means "interests, benefits"
2.very well usage: the basic meaning of well as an adjective is "health", indicating health status. It can be used as an attribute or predicative in a sentence. Well, there is no comparative and superlative form to solve "very good, very satisfied", "just right, most appropriate" and "not bad, nothing". Well, it can also be used in sarcastic, complaining and other tones as a preliminary concession before expressing opposition.
Third, the emphasis is different.
1. Very good emphasis: focusing on expressing Excellence in various qualities can be used from aesthetics to ethics.
2. Very good concentration: focus on expressing the body's "disease-free" and "health".