Emacs Key Bindings: C-h C-h and see all Help option or C-h b see this

    C-x f           search recent file
    C-h c C-p       display a very brief descrition of the command
    M-g-g           Go to line
    C-o or C-j      Open a new line on the top of current line and move cursor to newline / insert newline above
    C-x C-=         Zoom out / enlarge font
    C-x C--         Zoom in
    C-x C-0         default