Should I even bother remembering depreciated rendering?

I’m getting the hang of VBOs, FBOs, Display Lists, etc. I believe it was VBOs that were more modern and FBOs right behind it. I’ll miss the good old Immediate mode days, but since FBOs aren’t really depreciated(at least not yet), should I try to remember FBOs and mainly all the different rendering modes? I ass u med ( :point:see what I did there) that knowing all the rendering modes would be good to help others who use them, but would I ever need any depreciated rendering modes? Should I stick with VBOs until they possibly get depreciated and I need to render differently?