French past tenses - Passé composé or Imparfait ...?

[crashthatragedy]

Hi guys! I'm new to the French language and I am having trouble differentiating between the passé composé and imparfait tenses. Is it possible for someone to explain when do you use which tense, in detail? For example, when writing a diary, or recounting certain events of the past, do you use passé composé or imparfait tense? Last question: is it true that passé composé is more commonly used?

Thank you for all the help in advance!

P.S.: If anyone would like to recommend helpful resources and guides that facilitated your learning of the French language, or any music, movies and podcasts, I would greatly appreciate that too.