How to buy presale tokens?

So, I'm curious about how one might go about acquiring presale tokens. Could you walk me through the process, step by step? Are there any specific platforms or exchanges that specialize in these kinds of offerings? And what precautions should I take to ensure I'm not falling into any traps or scams? Additionally, how do I determine the legitimacy and potential value of a presale token before investing? Finally, are there any legal or regulatory considerations I should be aware of when engaging in this type of activity?