Aquariums: Just got into the hobby about two months ago.

Hey guys, how are you? Just introducing myself. I’m a newbie to Aquariums and absolutely love this hobby so far the adrenaline and excitement is like no other. I can literally sit at my tank and just watch the fish for hours. So I’m just posting here to ask or just to see what you guys recommend as the most important pieces of advice when first starting out in this hobby that applies to freshwater or saltwater. Looking forward to your answers. Also would love to hear your input on how my tank looks and what are your opinions on it. Thanks 🙂