What are your top five organic gardening tricks?

We’re seeing a number of complaints about snails and slugs this year and I thought it was pretty common to use beer traps to bait them and drown them, but I guess not. Do you have tricks you use to combat garden problems without the use of chemicals? Here are a few I use:
1.garlic planted around the outside of garden beds to deter deer and some insects.
2. Bt Bacillus thuringensis for cabbage worms.
3. Diatomaceous earth for slugs and snails.
4. Crop rotation.
5. Proper pH for the crop.
The last two are common sense but some new gardeners might not be aware of them. Got some others?