Use headphones
If you're recording with other people, like guests or co-hosts, using headphones is required. You don't want to capture the sound of others on the same audio track as yours. That would translate into an editing nightmare. Also headphones eliminate feedback because the sound from the other people is not hitting your own mic, it's only hitting your ears. They can also help you monitor your own voice. So, use headphones, or at least earbuds.
Use appropriate recording software
If you're recording solo, you can get by with using software that's likely already on your computer, like GarageBand or QuickTime Player (lets you record audio) on your Mac, or free software like Audacity on Windows.
To record with remote guests or co-hosts, you can use tools like Zoom or Skype, but they don't really produce high-quality audio. Zoom offers some kind of local recording, but your guest needs to know how to do it on their end, and you must collect the recordings from your guest after the recording session is over. All of this can be clunky and complicated. The main purpose of these tools is communication, not recording.
So, if you want to capture high-quality audio (and video) with your remote participants, and make it easy for everyone to record, you need a tool like Fusioncast.fm, which is specifically designed for podcasters to capture high-quality audio and video from all participants.
Check which devices you're using
Before you start recording, always make sure the devices you're using to record are the ones you intended to use. For example if you have a good external microphone (as recommended above), make sure the application you're using to record is actually using that one, and not your default built-in microphone.
Do not disturb
Put your computer on "do not disturb" mode to eliminate any distracting sounds or notifications while you're recording. Silencing your phone is probably a good idea too.
Avoid making extra noise
Watch out for extra noise made during a recording session, like placing your hands on your desk, typing, or moving your mouse around while you're talking. These can be hard or even impossible to edit out when they are on the same audio track as your voice.
Have any other tips? Let me know.
Happy recording!