From the B&H YouTube Channel:
AB from B&H introduces a new series on recording audio for video, which is designed to give you all the tools you’ll need to properly record audio for your video projects. This intro gives a basic overview of topics that will be covered in detail in subsequent videos, from choosing the right mic and location to setting recording levels and fixing things in post. If you want a good, basic intro to gear, tips, and techniques, this first video is a great place to start.
B&H has everything you need to record great audio.