most of my stuff was deleted
From the SSD, I assume. Is that the only drive in the PC?
Do you mean programs, or your personal stuff like documents, picture etc—I assume personal stuff.
If you only have a small SSD—say 128gig or smaller—it could fill up easily with just general Windows stuff. If you have 256gig it could still fill easily if you install more than 1-2 modern games.
If you go in the BIOS and change the boot order so the bootable media is first, you can reinstall the SSD and access your stuff.
If you can afford it, get an external backup drive and periodically backup your important stuff to it—just personal docs, photos etc, it's not practical to save programs to it.
For programs & the Windows system, you can use a program like Macrium Reflect to take an 'image' of the system drive and save the image to your external backup. I do that every 2nd Tuesday of the month, just before Microsoft issues their main monthly update—if your system goes bad, you're only ~30 minutes from getting it working again by restoring the image.