What types of services and items are normally payable by credit card? Are most paid via bank "slip" or bank transfer?

you're going to have to be more specific.

Some retailers will add 2.5% to the bill you pay if you use credit card.

If by services you mean utilities and the like - then none.

For example food at the groceries, to a doctor's visit, car insurance, washing machine, books, phone (land and mobile), cable tv, internet.

yes, no, no, no, yes (depends on source), no, no, no