AbaayoI don't see how that relates to what you said but sounds like something you heard in a YouTube sermon by a possible extremist
I chose a very bad example
Let’s say someone is fasting
You give them a meal for Iftaari
And you know what you get the same reward as their fast without allah taking their reward away
All good advised or taught to others bear that benefit
You teach someone to write tomorrow they may write novels thanks to your effort
A little thing can have big impact