Clean Magento 2 cache via Admin Panel
In order to clean a cache in Magento 2 please go to Admin Panel > System > Cache Management.
Press the Flush Magento Cache button.
Once the cache has been flushed you will see the success message.
Clean Magento 2 cache via CLI
In order to clean Magento 2 cache via command line interface use one of these commands:
c:c is a synonym to cache: clean
c:f is a synonym to cache: flush
Sometimes disabled cache can cause your website to load slowly which correspondingly causes some other issues.
So, is it important that you know when to enable Magento 2 cache to prevent unwanted issues. Unfortunately, Magento doesn't send you this kind of notifications by default.
But you can still receive them. Check out this article about disabled cache notification to learn how.