This guide will show you how to create .zip archives using 7-Zip. This can be useful for uploading files and folders to your server, because .zip files are compressed and therefore smaller and not every software can work with folders.
7-Zip is a free and open source tool for working with .zip archives. You can download it for free at https://www.7-zip.org/.
Start by downloading and installing it, if you don't have it installed already. Then download/create the folder/file you want to upload and right click on it in Windows Explorer.
Then select 7-Zip -> Add to "nameOfYourFolder.zip"
And your .zip archive is now ready to be used.