You can buy a lot of USB-UART converters e.g. with FT232, CH340 or CP2102. Each of USB-UART converters has some advantages or disadvantages.
Some doesn't have drivers inside kernel (linux) and/or windows. Another has a problem with faster communications.
I wanted to design own USB-UART converter and so I chose another IC for convert between USB and UART.
Broads is designed for beginners as one-sided PCB with a few jumpers.
I like IC by FTDI chip company. FT230XS.