Fetching and rendering is very easy.
As I mentioned initially, there are many training sessions and tutorials here on WA that take you through the process step by step.
I learned from our esteemed training guru Robert (aka @boomergp08) who, in my opinion, could not have explained the process more easily. Have a look by clicking on the below link:
https://my.wealthyaffiliate.com/training/how-to-ge...
I hope I made the concept a little clearer. Please feel free to fire questions, and I shall try to respond as effectively as possible. Or, if you have more to add on fetching and rendering, please chip in. Leave all your comments below!!
Giulia
P.S. If you found this tutorial helpful, have a look at more of my training here:
https://my.wealthyaffiliate.com/giuliab/training