1.

Wolf form can sense Poe Souls and dig through soft soil — use it to explore.

2.

The Hidden Skills from Hero's Shade are powerful — seek the golden wolf in each region.

3.

Clawshot (and Double Clawshots later) unlocks most late-game areas.

4.

The Magic Armor uses rupees as damage reduction — keep rupees topped up.

5.

Ganondorf has 4 phases — Beast Ganon, Puppet Zelda, Horseback battle, and final sword duel.

6.

Fishing at Hena's Fishing Hole with the Sinking Lure (HD: no restrictions) catches rare fish.