Possible things, which could easily come true

If it rains, I won't go to the swimming pool. If he comes today, we can go to the party. If you have enough money, buy some new clothes.

IF+ subject+present simple, subject+will+infinitive / modal+infinitive / imperative

If I had a better sleeping bag, I wouldn't feel so cold. If the jeans were black, I might buy them! If I won the lottery, I could buy a Ferrari.

Unreal, imaginary or hypothetical situations in the present or in the future.

IF+ subject + simple past , subject +would + infinitive / could + infinitive / might +infinitive

Used when the result will always happen. General truths, scientific fac

If water reaches 100 degrees, it boils. If you don't water the plants, they die. If you mix blue and yelloe, you get green.

IF+subject+ present simple, subject+ present simple