What Is The Purpose Of Amoxicillin And Potassium Clavulanate Tablets?

I am taking the below mentioned tablets. a) Azithromycin tablets - Brand Name: AZITHRO - 500 - Dose: 1 tablet each day. b) Amoxicillin and Potassium Clavulanate tablets IP - Brand Name: CLAVAM 625 - Dose: 3 tablets each day. Q1. What is the main purpose of these medicines ? Q2. Are there any side effects of these medicines ? Q3. What should I avoid eating/drinking in my daily diet ? P.S.: The reason I was prescribed these medicines was because my chest X-ray showed some tiny white spots. Thanks, Kamal (a.k.a. James)