Polymer clay is one of the most forgiving creative mediums you will ever work with. It does not dry out on the table. It does not require a kiln. It comes in hundreds of colors and it bakes in a regular home oven. For a beginner, it is genuinely one of the best places to start.
The projects that look the most impressive are often the simplest to execute. Earrings. Small pendants. Textured beads. Cabochons with marbled patterns. These are beginner-friendly shapes that yield beautiful results quickly enough to keep you motivated.
If you want to go deeper into polymer clay techniques, supplies, and tutorials, I teach extensively on this over at CreateAlong — but this article will get you started with what you actually need to know first.