If you have never heard about algorithms, take a step back, this is not complicated.
All of these terms often mean the same thing. A scene, a routine or a task is a set of specific actions to do. These scenes can be quite complex and take parameters and values from multiple sensors at the same time. This is where automation become fun and powerful. If you have never heard about algorithms, take a step back, this is not complicated. In fact, we, humans, are creating algorithms everytime.