I liked the online course “Marketing for NOT marketers” very much. For a beginner, this is exactly what you need. A sea of useful information on analytics and business promotion
And the main thing is simple and intelligible, using examples of “live” cases.
Thank you very much to Mikhail, for his patience and endurance, for the ability to delicately answer the questions of NOT marketers))
Good luck and prosperity to you and your agency) I recommend!