Here are some examples of how "ceci" is used in French:
* Ceci est mon livre. (This is my book.)
* Je veux ceci, s'il vous plaît. (I want this, please.)
* Ceci est important. (This is important.)
It's important to note that "ceci" is only used for singular nouns, and is typically used for things that are not human. For humans, you would use "celui-ci" or "celle-ci."