Probably the easiest of the soft plastics to start learning to fish with would be a simple plastic worm. Creme introduced anglers to a new way to catch bass many decades ago, but a plastic worm has stood the test of time as a productive way to catch bass all over the country.
Plastic worms come in a variety of lengths with a variety of tails. You have paddle tails, curl tails, straight tails, vibe tails and more. Each tail is designed to give the worm some sort of lively action as you lift it off the bottom of the lake and let it settle back. Some worms have a vibe tail on the end that has a cut in it so that as you steadily reel it in, it vibrates subtly under the water.
There are lots of ways to fish a worm and they work in a variety of conditions. It's narrow profile helps it come through cover, but a long curl tail will have a tendency to grab on to things underwater. It's great for fishing on long casts and working an area thoroughly to see if bass are there. Worms work great in clear and muddy water alike. They work well on Texas rigs with bullet sinkers. Most bites will feel like a slight tick, pressure or you will feel or see the bass swimming off with your line.