Are you sure about ESC? I looked at MacBook Air pictures on DDG, and they all had an escape key in the upper left. I've never seen a Mac without one. If you're using it for VI, Ctrl-[ is also ESC (and avoids stretching your fingers).

For delete, if you mean delete-under instead of delete-before (what the key labelled "delete" does), Fn-Delete is delete-under.

Home/End are either Cmd-Up/Down (doc begin/end) or Opt-Up/Down (line begin/end) (I haven't used a PC in a while, so I can't remember what Home/End do)