Alson I bought the game ultimate spiderman for my laptop, but my laptop doesn't have a DVD slot, so I wanted to ask how to put the game on a usb stick.
No. The game is copy-protected just like any software. The game won't start.
You will have to buy an external DVD drive for 15-20 euro and have to connect it via USB slot.
Can you send me a link from such a drive that fits my situation?
You can just look at https://www.amazon.de/...=sr_nr_n_2 or in any technology market.
An alternative to a CD would be to buy the game (s) as a "game key" for Steam in the future. In the price comparison, they usually cost significantly less than CDs and you are a bit more flexible.