In order to make it as easy as possible to manipulate epub files with little / no programming knowledge, I've created the epub cli (command line interface) tool. You can install and run this tool from your command line / bash prompt to read / write changes to epub files.
.NET 7.0 or greater
dotnet tool install EpubCore.Cli
If you are doing development work, it's easier to test if you just install from your local branch and run it up from there. Super simple pwsh to make this possible for ya.
pwsh install-cli-local.ps1
For a complete list of all verbs and parameters, have a look at Epub CLI Documentation