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Since their use is so ubiquitous, we’ve provided ERC20, ERC721, and ERC1155 wrappers of the Contract class with pre-defined ABIs for your convenience. When interacting with tokens, it is recommended to use these. Any of these contract wrappers can be created via a standard constructor requiring only the contract address. For example: 
ERC20 erc20 = new ERC20(contractAddress);
You may also provide your own ABI should you need to rewrite our default; however, doing so may require you to modify or rewrite the contract wrappers. An example of querying: 
string symbol = await erc20.Symbol(client);
BigIntegar balance = await erc20.BalanceOf(client, address);
An example of sending a transaction: 
TransactionReceipt receipt = await erc20.Mint(toAddress, DecimalNormalizer.NormalizeAsBigInteger(1)).SendTransactionMethodAndWaitForReceipt(wallet, client);
As a wrapper of Contract, you also have the option to not create the EthTransaction and send later on. 
CallContractFunction transactionCreator = erc20.Transfer(toAddress, DecimalNormalizer.NormalizeAsBigInteger(1));
EthTransaction transaction = await transactionCreator.Create(client, new ContractCall(wallet.GetAddress()));
TransactionReceipt receipt = await wallet.SendTransactionAndWaitForReceipt(client, transaction);

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Bonus: Ownable

Similar to with tokens, we have also provided an Ownable wrapper for your convenience as well which has a pre-defined ABI for methods implementing the Ownable interface. ERC20, ERC721, and ERC1155 all inherit from this, but we encourage you to use Ownable whenever you wish to interact with the Ownable methods on any arbitrary contract for convenience and safety.