FileZilla
FileZilla is what I use to transfer files from my computer onto a Web server. FileZilla allows you to transfer files to your Web directories using FTP (File Transfer Protocol). So if you need FTP, then you need a program like FileZilla. Alternative programs for FTP are WS_FTP, WinSCP and Cyberduck.
FileZilla does not have dark mode, but I find that to be the only major flaw.
FileZilla has a version that is "sponsored". Be sure not to download that version. That version is bundled with unwanted programs, and Windows Firewall may block it. Download from their full list of downloads, and be sure the word sponsored is not in the filename.