Practical rules for utensils – new, used, and public

Rabbi, can you please clarify the practical rules for utensils? When buying a new pot, pan, knife, cup, or appliance, how do I know if it needs tevilah, a berachah, kashering, or nothing? Does the material matter? Also, what are the rules for using utensils from...

why is chicken meat for basar bchalav

rabbi, a chicken and milk question. the torah says “do not cook a kid in its mother’s milk,” and the shulchan aruch (yoreh deah 87) says chicken with milk is only derabanan and fish is not forbidden at all. why did the rabbanim extend the issur to...