How to build healthy soil in a container garden?

Start with 40% cocopeat, 30% vermicompost, 20% garden soil, and 10% perlite. Top-dress with compost monthly. Add Trichoderma biofertiliser at sowing to establish beneficial fungi. Avoid walking on pots or compacting soil. Healthy container soil is dark, crumbly, smells earthy, drains in under 2 minutes, and supports vigorous root growth.