Can I Purchase one Microphone for multiple uses (talking head + screencast?

Hi, I'm new to course creation. I understand the importance of mics and am looking to make a purchase. I've read lots of posts about microphones but am unclear on this.

Is it possible for me to purchase a single microphone that serves multiple purposes. Specifically:

-Record talking heads videos

-Record screencasts

(and anything else I might need)?

For instance, can I purchase a good lapel microphone and use it for both of the above? Everything I'm reading indicates I need 2 types of mics.

Also, I have a Sony A7R IV that I use for photography that I may use to video the talking heads videos - if that single microphone solution could work with this Sony mirrorless camera that would be awesome.

Thanks for any guidance. -Justin

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