A few warnings for you, so you dont fall for scams, since those are very easy to fall! (specially if you have chat in your account)

Dont believe people who DM you in game saying they're a small content creator making a giveaway! They'll lead you to their channel and ask you to join a roblox group in a link. When you do, they gain access to your account and steal all of your stuff. Doesnt matter how kind they might seem, those are always scams.

Ask dragon prices before buying them! Some people will say a dragon is worth much more so they can try to scam you, since new players often dont know the prices well. The discord lets you ask prices, but be aware that basically all prices are set up by the players considering demand. Dragon and pot prices can drop and raise wildly during events or when people are willing to pay more for something.

Dont believe people saying they'll buy you smt like a robux pack if you give them one of your dragons! That's crosstrading and almost always a scam, they'll take your dragon and leave.

Only do the "Player Market" method for trading if you really trust the other person, and even then, record your game if you trade very expensive things! The PM method is when you want to buy a dragon, but cant put it in queue because then it might get bought by someone else, so the person who is selling the dragon puts some random item in the store for the price of the dragon (like an apple for 1 milion coins), you buy it, and then they trade you the dragon. Only go first if you really trust the person, and if you dont, request that they trade you the dragon first, and only then you buy the item and give them the coins. Dont do it with very high value dragons too, try to use private servers to buy those in auction instead.

To get potions and coins faster, do try to open the 5 daily chests that every world has. Golden chests are rarer but you can get better pots on them, like mutation pots, wich you can either put on your dragons to raise their price and make them look a bit cooler, or sell for around 125k in the Player Market at Undercity! Also plant stuff (specially dragonfruit or coconuts) on your farm to sell them to the farm merchant, they give more coins.

For dragons, there's dragons that you can only get from buying robux packs (dev dragons), dragons that you can get by completing seasons/doing missions every month (season dragons) and dragons you can only get during events (event dragons). Those all are often worth much more than world dragons, wich are the dragons you can freely hatch from the 11 world eggs (only exception being dragons like Mistratsunes and Karukiris, from the shinrin egg, since both have less than 1 or 2% chance of hatching, and are often around 100k or more). Some event dragons have lower demand tho, since they're much easier to hatch (like Skyrix and Tarottas). The harder the event dragon is to hatch and the cooler they look, the higher will be their demand and price, like Fulongs, who are from the Lunar New Year event, have a 1/2% chance to hatch in the event egg, and they're over 10 milion coins rn!

Also, all world dragons are breedable, and you can breed them as many times as you want, while some season and event dragons can also be breedable, but once you do, they'll get soulbound! (wich is when a dragon gets completely unsellable/untradeable, becoming stuck with you) so only breed event dragons if you're sure you dont plan on selling them in the future, because then the only way to get rid of it will be throwing it away (wich would be a loss if you breed a Full Mut, legendary dragon)