I need help to install Debian

I need some guidance. I have a laptop with two SSDs, where one has Windows 11 installed.

I want to install Debian on the second SSD with encryption.
Last time I tried, I accidentally wiped both my SSDs and my wifi didn't work. I think I probably chose the wrong Debian ISO and I must have installed the EFI partition in the wrong location.

How do I select where to install Grub or EFI partition? What else to think about?

Sorry for probably asking a question that I assume for most of you are very simple and straightforward to figure out, but as I said I didn't manage the last time