Question Sound Card and Dell laptop

Mar 20, 2023
My Dell is 11 yrs old. Do I need a new sound card, or just get an external one?
I am transcribing individual speakers in court and other formal settings. My proofreader says I may need a sound card.
I also have wireless and regular plug-in headphones.
What is the best sound card for discerning people talking via audio, and can I use either wireless or plug-in headphones?