If your audience can't hear you, they're not going to tune in. The extremely versatile Blue Yeti Microphone is one that has been used by YouTubers, Streamers, and Podcasters for years now. With it's basic USB connection, it's simple enough for a beginner, but has the potential to deliver on some professional-grade sound.
As you gain experience and become more comfortable with the hardware, you might work your way into audio interface setups and more complex, specialized microphones. But for anyone starting out, the Blue Yeti makes an enormous impact that you'll be appreciating for years.