So I'm a bit new to dnd, and I'm not entirely sure how to best handle this.

I'm running a Wizard through the Curse of Strahd campaign. My DM has been pretty relaxed on what spells my character is able to learn and cast, as long as the material components are readily gatherable. No Chromatic Orb for instance, but I don't need to keep track of exactly how many tarts or how many feathers I have to cast Tasha's Hideous Laughter. I have justified my Wizard being able to simply HAVE spells when he levels up (5 or so per spell level) as his backstory involves him being an amnesiac wizard, so rather than him growing in power, he is remembering some of his old capabilities (This ends around level 6, which was his roughly his pre-amnesia power. It makes sense in context.)

With that being said, my character has come across and acquired a spell book containing, as a direct quote from my DM, "Every Common Wizard Spell". What would, in your opinion, that contain?