"It's easy"
I don't like this phrase.
In my experience,
- Working out & self-improvement is hard
- Becoming a good design-engineer is hard
- Learning Mandarin is hard
If these things were easy, everyone would be doing them.
For me at least, the struggle of the task is part of the reward of seeing it through. It's hard, but I'm doing it anyway.
Telling someone "it's easy" is doing them a disservice: it devalues the work they put in, and makes them feel like shit if/when they encounter obstacles.
For example, "I've been there; let me know if you need any help!" is a solid alternative — offering support, without giving unsolicited advice.