You're gonna need a microphone or two. The cool kids call them “mics” (pronounced “mikes”).
Buy one of these, depending on your needs and budget:
The Audio Technica ATR2100-USB (and it’s fraternal twins, the AT2005USB and Samson Q2U) is podcasting’s standard “training wheels mic”, for pretty good reasons:</p>
It’s fairly cheap
It supports both USB and XLR, so you can plug it right into your computer to start and then graduate to XLR once you get a proper audio interface or mixer
It includes everything you need, including cables and a cheesy desk stand
As a dynamic mic it’s less sensitive than condenser mics, and so more forgiving of noisy environments
The Samson Q2U is effectively the same mic as the ATR2100-USB, so it’s also a good option and may be cheaper\/easier to get depending on where you live.
Tip: Mics go on sale sometimes, so you can often snag a good deal using sites like CamelCamelCamel to set up an Amazon price watch for ones you're interested in. Plus, competitors often match Amazon sale prices, too.
There's many kinds of mics, but for our purposes we're going to divide them into:
Dynamic versus condenser
USB versus XLR
Either would work fine. You'll get more recommendations for dynamics because they're less sensitive and so more forgiving in bad recording environments.
A mic's transducer converts sound pressure into an electrical signal. Although both dynamic and condenser mics have a membrane that vibrates with the air around it, they use different transducer principles.
Are typically more sensitive than dynamic mics
Require power (delivered via USB or "phantom power" via mic cables)
Are less sensitive than dynamic mics, and so can be more forgiving for beginners
Can sometimes require power (generally called "active dynamic mics")
In a multiple mic scenario, the problem with USB mics are that they each have their own hardware clock, without anything to keep them in sync.
As a result, the audio from one or both of them has to be continuously resampled to keep them in sync.
macOS has built-in support for doing this (by creating an "aggregate device"), and you can do it on Windows, but there's always going to be some quality and reliability impact. I'd doubt that the quality impact would be perceptible in the end product, so for me the main consideration is that it's intrinsically just a bit wonkier.
This is the most popular myth in podcasting forums.
Mic sensitivity is linear regardless of the transducer (the thing that converts sound pressure into an electrical signal) technology.
Dynamic mics ARE less sensitive, but if you turn up their preamp gain to match a condenser mic's they'll both "hear" all the same stuff. For more, see:
15 Popular Audio Myths (see section "Myth: Capacitor mics ‘pick up more of the room’ than dynamic mics")
Top 8 Microphone Myths Exposed (see item 6, which also applies to dynamic vs. condenser)
Boom stands are great because they allow you to sit naturally and bring the mic to you, rather than leaning into the mic. The user will sound more natural as a result.
Dynamic mics are often recommended for beginning podcasters because they're more forgiving for people who don't know how to control environment noise. That said, wonderful dynamic mics (like the SM7B) are wonderful.
Because condensers are more sensitive, you can always make a condenser less sensitive (i.e. more like a dynamic mic) by reducing gain and using E.Q. to reduce high frequencies. The opposite is generally not true.
There's a myth that condensers somehow pickup more "noise" than dynamics. This is untrue. A more sensitive mic will simply picks up more of all sound, whether signal or noise.
[amz-ev-re20]: https://www.amazon.com/dp/B000Z7LLQ0/ "Electrovoice RE-20"