Brake Fluid Change

Hello all you lovely people!
In advance, thank you for your help - you've all been fantastic with info on my Treg so very appreciate it!

I am preparing to do some maintenance to my Happy Wagon and I see I should replace the Brake Fluid every 2 years. What do I need to purchase/order? I typically go thru NAPA Auto Parts.

Also, what does this entail with the brake fluid change?

Thanks all!

Tricia
2004 TDI 190k miles