Future forms - check/recap
Present Continuous - future arrangements; often with time, date, place
--> I am going to a wedding on the 4th of May.
Present simple - schedules, timetables
--> The bus leaves at 10 am. / English class starts at 10 AM.
Be going to + infinitive - future intentions, plans = already decided to do smth & you tell people about it (think - NY's resolutions)
--> I am going to work out twice a week.
WILL - spontaneous decisions & predictions
--> I think I'll have a coffee. / It will snow tomorrow.