If I only had to fish with one lure for Bass it would be a Senko. These rubber worms can be fished in a variety of rigging styles, but I find the Texas rig and Weightless to be the most effective, with the Wacky rig coming in close as well. 5” Senkos using a 3/0 offset worm hook is a good place to start. I tend to have luck with darker earthy colors, but it is good to have a variety. These lures take practice to get good with. Senko fishing is a skill in and of itself. Here is a link to a video that talks about the different rigging styles.
Senko Fishing