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How can I get the Dao coin of dota2? What should I pay attention to when I buy dota2

How can I get the Dao coin of dota2? Dao coin in dota2 is the game currency obtained by recharging with RMB. The exchange ratio is 1 RMB = 100 Dao coin. Dao coin can be used to buy goods sold in the official mall. So what should I pay attention to when I buy dota2?

Note: dota2 is a system in which players trade with each other. Players can top up dollars in their steam accounts, and then buy items in the steam market. Buying items in the steam market is usually much cheaper than buying items in the official market with knife money.