Will Dell USB C 45W charge this MacBook? Will MacBook damage?
The thing is - it has 5V and 20V and amperage which I don’t know if not too high
I do not want to burn anything
Here is the details of your MacBook USB-C power adapter: What's the difference between Apple's new 30W USB-C adapter and the old 29W one?
Looking at your image of the Dell unit you'll see the output is 5 Volts at 2.0 Amps or 20 Volts at 2.5 Amps (45 Watts)
Clearly its more powerful than what your system came with. I’ve not verified this so I’m hoping Apple complied with USB-C PD All You Need to Know About USB Power Delivery. If it has then you’re just fine!