Tibor Vagyon You can find the Terms & Conditions here: https://www.bunq.com/legal/personal They're written in a quite easy way to understand. But if you still don't want to go through them in full, I would recommend reading these chapters at least:
As you can see from the fair use section, bunq is not particularly a crypto-friendly bank (it's not forbidden, but you might need to provide documentation if you buy/sell crypto currencies). Cash of course is inherently risky for any bank, so for higher cash amounts you should also be able to provide sufficient explanation. And transfers to or from high-risk countries might also be something you would want to either avoid or make sure you have the necessary documentation for everything.
Basically the tips to not getting blocked would be the same as with any other regulated European bank. They are not inherently different from each other.
