What is your level?
If you don't know, start at B1: it's where most of us are. You can change it whenever you like.
A1-A2 Beginner Survive: order food, introduce yourself, ask questions, understand the basics. 154 lessons B1 Intermediate Tell your story: experiences, possibilities, opinions. The level you need for work. 68 lessons B2 Upper intermediate Discuss: nuances, arguments, fluent and natural English. 52 lessons C1-C2 Advanced Master it: academic register, emphasis, rhetoric, style. 91 lessons