Lens choices are simple, as long as you know exactly what you want to do with the camera. Decisions come in two stages.
First, you need to decide the field of view you want to use. Many people call this "focal length," but the idea is to decide whether you need a wide field of view, a narrow field of view, something inbetween, or whether you need a variable field of view (called a "zoom lens" by many people).
Second, you need to decide how much you want to pay for the lens. This determines whether you'll get an expensive "fast" lens or a less-expensive unit. Since expensive lenses tend to be larger and heavier than less-expensive lenses, size and weight are also part of the second decision.
That's it. Every lens buying decision falls in those two categories. Many vendors' web sites are set up to let you follow that path to decide on a purchase.
Example: you want what some would call a normal to narrow field of view (called normal to short telephoto by some). That narrows your choice to a specific group lenses. Then, you choose on price. If you don't want to spend a lot of money, you settle for something like the Canon EF-S 55-250mm lens. If you want to spend a lot of money, you go for a Canon EF 70-200mm f/2.8 IS II, which costs about ten times as much as the 55-250mm lens. Or you choose something between those extremes.
Simplify the choices to the factors of field of view and price, and decisions are easy to make - as long as you know exactly what you want. From the messages left in this forum, that's the main problem most people face: they don't know enough about their photographic needs and desires to be able to make a decision.
And, one of the worst factors in purchasing lenses can be to mimic what others have done.