How much effort do you give after being sick ? Is drinking coffee or expresso bad? How do deal with a stressful environment, reason behind macros? When should you eat what portion, etc

How to work back into your workouts after having covid (a few days of 70% effort? or go right at it?)  Is drinking coffee or espresso good or bad? Sometimes I get bored of plain water and look for something that has flavor. I’ll use some hydration vitamin drinks but sometimes looking for another option. How to do deal with stressful environment  The reasoning behind macro weighting throughout the day. When should you be eating what portion and why.  Picking different types of foods and why