We use Future Simple when:

1) спонтанное решение - I want an ice cream. I will buy it
2) обещание/предупреждение - I will punish you!
3) предложение идеи или помощи - I will help you to do your homework
4) предсказание - it will rain
5) события в будущем, которые нельзя изменить - he will turn 15 on Monday

Future Simple +

I will buy a chocolate bar

Future Simple - (will + not = won't)

I won't buy a book

Future Simple ?

Will you help me?

Now you now the Future SImple tense. See you next time!

Good for you!