Prof. @lemouth Thank you so much for taking the time to have a glance at my post and thank you Prof. @eniolw for spotting and pointing it out (From the many you have to go through each day)
It's a pleasure for me that you liked my not so interesting content! (not for us, lol). Here, I am using the term operand (basically a function, as you said) just to make it significant that an operator needs a function to have a meaningful mathematical operation. I'll continue this series on quantum mechanics :)
I am definitely not going away from my field anytime soon (enrolled in PhD, so no choice, lol) :)