What Should You Know About No-Deposit Casino Offers?

I have recently noticed that no-deposit bonuses are mentioned quite often when people discuss online casinos. The idea sounds interesting because these promotions may not require an initial deposit, but I assume there are still conditions that need attention. For example, are there usually wagering requirements, limits on potential withdrawals or restrictions on which games can be played? I would also like to know whether account verification is necessary before claiming an offer. I prefer to understand the rules first instead of getting carried away by an attractive promotional headline. Does anyone have advice on what to check?