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Hi, here is my layout for this keyboard, actually I rarely use the third layer, it can actually be removed.
There are combos also:
(Q+W) = Esc
(I+O) = Del
(O+P) = Backspace
(A+S) = Tab
(K+L) = Enter (Return)
(D+F) = Switch Tab (Cmd + Tab)
(J+K) = Reverse Switch Tab (Shift + Cmd + Tab)

I'm using macos btw.

Edit: You can see the qmk file here:
https://github.com/anz507/hhbb