Learning to Use the Future Simple Tense
When you use the Future Simple form, 'I will', your focus immediately goes to actions that have not yet happened, or things that you intend to do. So, its Core Characteristic is about making predictions and expressing ideas that you think or hope will materialise in the future. It is important to note that the Future Simple is not generally used to describe established plans or agreed timetables.
It will rain at the weekend
I think Croatia will win the next World Cup
For example, It will rain at the weekend, is a prediction; as is, I think Croatia will win the next World Cup. Your Reference Point (R) is at the point in time of the predicted action. This is because you are predicting (imagining) a future action: