"Classic Trading Volume Mnemonic"

Buy horizontal, buy at the dip but do not buy vertical; the selling point is right at the boiling point.
Continuous small increases are real increases, while continuous large increases require exiting.
A sharp drop with low trading volume is intimidation; a gradual drop with high trading volume means you should withdraw quickly.
A significant surge needs to pull back; don't dig deep pits and don't buy heavily.