You don’t have to be a coding genius or experienced server administrator to run a WordPress website. Knowing a bit of PHP and basic about rewrite rules can always help though. Monkeyman Rewrite Analyzer for WordPress is a handy plugin that helps you make sense of your rewrite rules.
This plugin does not change your rules but helps you better understand how your changes will turn out. You can try out different URLs to find the matching rules. Since no changes are made, you can experiment with this plugin with peace of mind.