the paste
When you use WordPress for the first time, it is very inconvenient because you cannot copy and paste images in the default editor.
To solve this, you need to install a plugin.
(This is not the case, but installing too many plugins that use the database may cause the administrator to slow down, so install only what is absolutely necessary.)
Under Plugins, click Add new plugin.

Find and install the plugin called The Paste.

Now you can simply paste the image into the editor using Ctrl+c Ctrl+v.