Where can I buy GMX?

Excuse me, I'm a bit new to the world of cryptocurrencies and I've been hearing a lot about GMX lately. Could you please provide me with some direction on where I could potentially purchase GMX? I've tried searching online but there seems to be a plethora of options and I'm not quite sure which platform would be the most secure and reliable. Could you recommend a few trusted exchanges or marketplaces that offer GMX trading? Additionally, are there any specific steps or considerations I should take into account before making my purchase? Thank you for your assistance.