How do I make sure my tickets are not fake?

Good afternoon, I'm curious about how I can ensure that the tickets I'm purchasing for an upcoming event are authentic and not counterfeit. I've heard of people falling victim to scams where they've ended up with fake tickets, and I'd like to avoid that scenario. Could you please provide me with some tips or advice on how I can verify the authenticity of my tickets? Thank you in advance for your assistance.