Which is better: donating by sending text messages, putting money in charity boxes, giving money to the poor by hand, or putting money under the door of a house and then ringing the doorbell?

Donating by sending messages or placing charities in the boxes of trusted organizations is hoped to bring good and may lead to the concealment of charities. However, it is better to disclose obligatory Zakat than to conceal it, unlike voluntary charity. As for placing money under the door, it is better for voluntary charity due to the concealment involved.