Where can I buy Cardano ADA?

Could you possibly provide me with some insights into the locations where I could purchase Cardano ADA? I'm eager to invest in this cryptocurrency and I'm searching for reliable platforms where I can make a secure transaction. Would you recommend any specific exchanges or marketplaces that offer Cardano? Additionally, are there any factors I should consider before making a purchase, such as fees, trading volume, or liquidity? Your expertise in this field would be greatly appreciated.