机器运转状态良好 Machines are working properly(don't have any problems.) 他的身体状态良好 He is in good health. 良好的生活习惯对健康很重要 it's very important to have good habits of lives in order to stay healthy. 他受过良好的教育 He got educated very well. 中德两国关系良好 China has good relationship with Germany. 良好的基础是学好中文的关键 Good basis is the key for learning Chinese. It means good or well but we don't say like 他这人良好，we say 他这人很好，他这人非常好etc. For he is a good guy. As I mentioned above, you can use 良好 to describe things like education, habits, state of health or machinery, relationship between countries (if you use it in people's, not wrong but I won't recommend), feeling, basis, etc. but we barely use it in speech. *Some fixed. That's the wrong place I've put in, sorry

机器运转状态良好 Machines are working properly(don't have any problems.) 他的身体状态良好 He is in good health. 良好的生活习惯对健康很重要 it's very important to have good habits of lives in order to stay healthy. 他受过良好的教育 He gets educated very well. 中德两国关系良好 China has good relationship with Germany. 良好的基础是学好中文的关键 Good basis is the key for learning Chinese. It means good or well but we don't say like 他这人良好，we say 他这人很好，他这人非常好etc. For he is a good guy. As I mentioned above, you can use 良好 to describe things like education, habits, state of health or machinery, relationship between countries (if you use it in people's, not wrong but I won't recommend), feeling, basis, etc. but we barely use it in speech.

“良好” means "good" , but not excellent. Excellent 完美，非常好 Great 很好 good 良好 ok 可以； 合格 not ok 不合格 bad 差

it means good which is between excellent and okay.