Caching is a complex technology that does one simple thing really well: it makes your website really fast. And speed is critical to the success of your site because people don’t like waiting around for web pages to load.
How caching works?
Caching generates a copy of your web page and stores it on your server as static files.
Then after, when a visitor reaches a particular page of the site, the server shows off a cached page rather than re-querying your database and generating it dynamically.
This process speeds up the page response time and reduces the server resources needed for creating and serving a web page.
In real life, when you do something for the first time, follow some steps.
Suppose you make a new cake, read the recipe first, prepare all the ingredients you need, measure them, read the recipe in points, and finally start preparing the cake. But when you make the recipe for the tenth time, you don’t have to read the recipe, to measure ingredients. You are so familiar with everything you have to do, you do it automatically.
Well, that’s kind of how caching works.
Websites are generally viewed hundreds, thousands, or sometimes even millions of times per month. Normally, each time a browser requests a web page, the server has to do a bunch of complex (and time-consuming) tasks. It retrieves the latest posts, generates the header and footer, finds your site’s sidebar widgets, and so on. However, in many cases, the result of all these will be exactly the same. Wouldn’t it be great, then, if we could simply make the server remember the final result, instead of processing each request separately? That’s exactly what caching does!
Why do I need caching?
It’s like doing the same recipe for the hundredth time and still follow the same steps as you did for the first time. Waste of time and totally unnecessary.
What if I make changes?
Well , a caching system doesn’t just consist of the mechanism to store prepared HTML files, it also has a way to empty the cache (and then regenerate it) when specific conditions (such as the publishing of new content) are met.
How I enable caching on my WordPress Site?
The simplest way, with a plugin. There are plenty of cache plugins, for beginners, advanced, free, premium, just find which is best for you.
Never use more than one caching plugin. This will not make your site faster, it’ll likely make your site a lot slower, and break it in the process.
If your host service has a built-in cache, I recommend not using any caching plugin at all.
Well, that’s it, nothing complicated, because you practically do nothing, but still a critical matter for your WordPress blog. However, this does not magically solve all the speed problems. The first problem remains web hosting, then your images.