Guys any tips one getting cubes?

Question

Sadly I don't have pro so I need cubes to regain hearts and I'm so broke. Look here:
https://www.sololearn.com/post/1788449/?ref=app

Answer 1

Sorry, i don’t understand. I looked at your profile and it says you are on lvl 16 yet you are taking a few intro courses. And now you are sayni g that you keep running out of bits.
This doesn’t add up.
Unless there is some bug here.
It looks like you are trying to get more xp than learning anything.
Not saying it is certainly the case, just how it looks. And as i said it may be a bug.
But if I’m right try to think about what benefits there may be from the heart system.