Knifes 3.0?

so this is a add on to my other question so when I asked what metal I meant like if you had to pick a specific type like the exact name and stuff what would you pick and where would be the place to buy it also no body answered if a knife has a core like a strong metal covered in a different metal and where could I get thing heat treated or how much does heat treating stuff cost go In depth in all the question please and if there is more I should know go ahead and tell me (ANSWER THE QUESTION I ASKED DIRECTLY DONT TELL ME TO GO SOMEWHERE OR ANYTHING UNLESS U HAVE ANSWERED EACH QUESTION DIRECTLY)