Copyright is an important concept for the photographer. Copyright is a legal right that grants the creator of an original work exclusive rights for its use and distribution. You, as the creator of your imagery, are the copyright holder of your work. The moment you capture an image, you own the rights to that image. Below is a video of how to embed copyright information in you image files through Adobe Lightroom Classic CC.
For reference, the Keystrokes referenced for the Copyright symbol (©) are:
Mac: Option +G
Windows: Alt + 0169