main vim commands

ctrl-ww = cycle though all windows
gt = next tab
gT = previous tab
t = Open the selected file in a new tab
i = Open the selected file in a horizontal split window
s = Open the selected file in a vertical split window
o = open directory

h = left
j = arrow down
k = arrow up
l = right

v to begin character-based visual selection, or V to select whole lines, or Ctrl-v or Ctrl-q to select a block.
d (delete) to cut, or y (yank) to copy.
p to paste after the cursor, or P to paste before.