We can use the present continuous to talk about the future when we have already arranged to do something. We can use be going to to talk about something that we have decided to do
We use used to + infinitive to talk about an action that happened regularly in the past but doesn’t happen now. Used to is different to the past simple because it emphasises that the action
We use the present simple tense for things that we do regularly and for facts, habits, truths and permanent situations. We often use time expressions like every day, once a week, on Fridays, etc.