To execute those commands you just have to run it from the console (if you have op it won't work, because the same to prevent use the commands). The skript can't block the command sudo or similary because it are using the function of on command and this don't detect the use of forced commands [only in older versions of Skript], don't give to players the permission to use sudo commands or similary for your risk. Do you want to know how to block the/<tab> on your server? You must go to your main server folder and enter in the file spigot.yml, search the option commands.tab-complete (tab-complete: 0), replace the 0with -1 and restart your server to apply the change.
Here you will have the list of plugins necessary for the skript to work correctly on the server without errors. If you have an error on start the skript, report to the creator in Discussion.
SManager: We help you with pre-made functions to modify your server with multiple-options.
NovaDetector: This is a alternative skript anticheat for you server, this block more types of cheats in your server, you can use this with FoxAC to block cheaters with more certain.
FoxAC: This is a re-code to try to make a better anticheat for your server, which includes new code and new checks, but does not contain all the checks.