Living in Portugal as a student

Hi! I will be a student in Braga in the 2nd semester in Braga and I have a few questions.

1. Where should I do my groceries for affordable prices?
2. What are some tourist traps?
3. What should I visit? Braga/Porto
4. In my country we have DM for cosmetics, skincare etc which is affordable. Is this store in PT? If no, can you give me some affordable options?
5. How much is the cost of living, including transportation, groceries, eating out ( where should I eat and what are the best foods in this area?), maybe traveling, etc?

Thank you!