Without much information about your purpose and your knowledge of Writer features, here are bits of information.
Versions becomes enabled once the documents has been saved.
When you want to record a “snapshot” of your document,
Versions and press
Save New Version. There is also a check box labelled Always save a new version on closing. This may be what you are looking for.
I recommend you experiment first to see if this fits your need. I warn you this is a rudimentary feature which has adverse effects. When you decide to revert to a previous version, this makes all later versions inaccessible!
To show the community your question has been answered, click the ✓ next to the correct answer, and “upvote” by clicking on the ^ arrow of any helpful answers. These are the mechanisms for communicating the quality of the Q&A on this site. Thanks!
In case you need clarification, edit your question (not an answer which is reserved for solutions) or comment the relevant answer.