DYNAMIC in cf-cache-status

In cf-cache-status is coming DYNAMIC when it is single post. In the url is added “/Mobile/10rec/”. My plan is free. Anyone know the reason for DYNAMIC?

Is it HTML content? HTML isn’t cached by default, only certain specific file types Default Cache Behavior · Cloudflare Cache docs

If you want to cache HTML you can use a page rule

Would it be in page rule?
How could I define this rule?

Take a look at this: Create Edge Cache TTL page rules · Cloudflare Cache docs

Read the warnings on the page carefully. Caching HTML can be dangerous.