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Any other packages they need as prerequisites would also get installed. Those are selected by name, and no version number specified means install latest known that is available in registered repositories. So this installs – probably from Mint’s official repositories if you haven’t done this kind of thing before – the SSL-secured version of package download function (apt-transport-https), and another tool that can be used to do various network-related tasks from the command line (curl). Using SSL-secured traffic was traditionally not considered important because all packages are automatically verified before install anyway, using gpg and prepackaged keys. Your system may not be set up to use https instead of http for package downloads. It installs two tools used by the rest of the procedure if you didn’t have them already.
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This part may or may not actually do anything, depending, but just in case. Sudo apt install apt-transport-https curl
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