The first is generally used to describe things that will happen in the near future. The French near future uses the verb “aller” (to go) in the present tense + the main verb in the infinitive. For instance:‘Je vais manger’ (I am going to eat), ‘Tu vas manger’(You are going to eat) ‘Elle va manger’ (She is going to eat)The second way to conjugate the future in French is to take the infinitive (EG manger) and add ai, as, a, ons, ez, ont on the end. You would write the future tense of ‘manger’ like thisJe mangeraiTu mangerasIl mangeraNous mangeronsVous mangerezIls mangerontRemember this is generally used for things further in the future. It could be interchanged with ‘shall’ in English. For example, next year when I am on holidays I shall eat caviar.