Teachers very often have to teach new topics to children or have change the way they are teaching a topic following recent changes. This can be challenging for a teacher, to be able to think up a new way to cover all the areas they need to. Phonics is something that was not really around as much when I was growing up, but recently teachers have been told that this is the way they need to teach young children about the alphabet and the way to pronounce words.
Some teaches have had to go on specific courses to ensure that they first understand what it is all about and then how to teach it to children.
If you are struggling with teaching a certain topic, then you could have a look on the internet for inspirational ideas. Many teaches upload lesson plans and even printable material that you can use.