Where can I buy Stellar Coins?

Could you please tell me where I can purchase Stellar Coins? I'm interested in adding them to my cryptocurrency portfolio and would like to know the most reliable and secure platforms to buy them. Are there any specific exchanges or brokers that you recommend for buying Stellar Coins? Additionally, are there any specific steps or considerations I should take into account while making the purchase? I'm relatively new to the cryptocurrency market, so any advice you can provide would be greatly appreciated. Thank you in advance for your help!