What is the profitable, lawful Islamic trade that involves no cheating or deception, with no capital required to start it?

Avoiding cheating, hypocrisy, and deception in transactions is among the reasons for their profitability and for obtaining blessings therein, as the Prophet, peace and blessings be upon him, said: "If they are truthful and clarify, blessings will be bestowed upon them in their transaction; but if they conceal and lie, the blessing of their transaction will be effaced." The means of lawful earning are many, such as leasing and Mudarabah (profit-sharing). One can consult specialists in commercial transactions.