Something about trading card bot

I'm collecting cards for a long time and I'm trying to create a bot that do these things:

1: Trade 1:1 for the same set card (doesn't have to be duplicate)
2: Trade 2:1 for cards of different sets (with the same price)
3: Trade 1 coupon for 1 card
4: Auto craft a badge when it's possible
5: Auto open booster packs

But I need some help to creating this also because I will study C++ language next year at school

I know there are lots and lots of bots of this type, here a "little" list

Here some questions for you

• Do you usually trade with these bots?
• Do you know how to create a bot?
• What do you think about these bots?
• Do you think they are legit or not? Why?