can someone tell me the basics of kosher.?

mcdonalds

It's very long and difficult to explain all the rules, but to shorten them down:

Animals - Must have split hooves and chew their cud (both signs).

Birds - Cannot be predatory

Fish - Must have fins and scales (both signs).

Not a drop of blood is allowed (not even in an egg).

No bugs (except for a certain kind of grasshopper).

Food that can't be eaten together:

Dairy and meat (Biblically)

Dairy and chicken (Rabbinical - from the Talmud)

Milk and fish (Rabbinical - from the time of Rav Yosef Karo).

All meat must be slaughtered by a Shochet (ritual slaughterer) who is an expert on cutting in a way that causes minimal pain to the animal. Also, there are rituals of how to get rid of the blood from the meat since not a drop is allowed.

That's the very basics.