When I had a giant digital SLR, I only used one lens. It was a terrific wide angle to big zoom (28-300 mm equivalent). It was so versatile I never took it off. I did buy other lenses, like a “nifty fifty”, or 50mm equivalent because all the cool kids had them. Photography is like that, you hear about a lens and then you need that lens. You may not know why but you do. I hardly ever used that lens. It took beautiful photos, and was super fast so I could take photos in low light but the focal length just didn’t work for me. I loved it for portraits but I had to be right in their faces to get a good shot so they usually had a look of horror on their face because I was so close to them!
When I got my mirrorless camera (the Olympus E-M10) I bought a lens much like it, the Tamron 28-300 equivalent. I love that lens, all the versatility of my old lens but at less than half the weight and about 40% of the volume. I didn’t need any other lenses.