For autoflowers, I recommend using soil with a good phosphorus content, not just nitrogen! This way, your plant will transition from vegetative to flowering easier and faster! Soil with high nitrogen content and very low phosphorus (often cheap soil from flower shops) will negatively affect your plants throughout their life! 👆
Usually, cannabis soil in its name indicates its purpose! There are recommendations for soil for growing cannabis online 👌 One of the famous and popular soils from this company is https://foxfarm.com/
Good luck, bro! ✊😇