1.

Conduct wind with Wind's Requiem to sail in any direction — essential for exploration.

2.

The Swift Sail (HD version) doubles sailing speed — get it from the auction on Windfall Island.

3.

Tingle Tuner (GBA cable, original) / Tingle Bottles (HD) give hints and bombs.

4.

The Forsaken Fortress is revisited — save your best gear for the second visit.

5.

Pictograph Box is needed for quests — photograph every named NPC and enemy you meet.

6.

Triforce quest is the longest fetch quest — start collecting charts early.