I'm absolutely confused when it comes to cases in English, and more so when I'm studying other languages (leisurely). I've tried to learn cases at least three times in my life and every time it just slips my mind because it's so confusing for me.
Is there any online tool (probably using AI) that highlights the case of each word in a sentence/string? If there truly isn't, what online learning resource can you recommend for me to learn cases (in all languages) as efficiently as possible?
Even better, can someone give a succinct introductory overview here?