What difficulties did Robinson encounter on a desert island, and how did he solve them?

1. No food solution: collect food, sow food and domesticate wild sheep on a desert island.

2. Refuge plan: Choose a relatively safe cave with water nearby on the mountain, and insert solid wooden stakes around the cave to guard against savages and wild animals.

3. Solution of daily necessities: make some casual barrels, pots, bowls and so on with clay.

I probably remember. ..