What is "I head over to the farmer’s market across the street ". I couldn’t understand what is “head over to”. Can anybody help me, please?

If you think of “head over to” as the same as “go to” then you probably would never have any problem. The meanings are very very similar.

head over to the market = make my way toward the market = go in the general direction of (with the intention of eventually arriving at) the market

Thank you, kbc. You’ve really helped me.