Each category of commands has their own page which can be found on the sidebar. Aliases: [foo|bar] means that you can use either foo or bar Optional: [foo] means that this argument can be ignored (this is usually for clearing settings or for using yourself/the current channel) Optional with default: [foo='muted'] means that it will default to the value if you don't specify anything else Required: <foo> means that you must use this argument for the command to work Many: <foos...> or [foos...] means that you can specify more than one. Massban is an example of a command that uses this. If you wish you use an argument with more than one word, use "double quotes" to let the bot you know what you want.
Additionally, the bot uses what are called converters which makes specifying roles, members, channels etc easy and fool-proof. When asked to specify a member, you can provide it a mention (pinging the person), an id, their name or their nickname. This principle works for every single command where applicable.
Check out the reaction roles page There is an example at the bottom of the page of me setting up reaction roles for my bot server that a lot of people seem to find useful.
Use the website! at https://carl.gg it's much easier than doing it with commands.