Click the Apple logo in the top-left corner of the screen. A drop-down menu will appear. This option is near the top of the drop-down menu. It's in the System Preferences window. Doing so opens a new window. This tab is at the top of the Keyboard window. You'll find it at the top of the Keyboard window. Doing so will prevent programs on your Mac, including WhatsApp, from correcting automatically your typing.

TL;DR in Chinese:
打开Apple菜单。 点击系统偏好设置…。 点击键盘。 点击文本。 取消勾选“自动纠正拼写”选项。