Trying to Understand Leading and Lagging Indicators

Hey everyone, I’ve been learning trading for a few months now, mostly through demo accounts and YouTube videos. Today, I stumbled upon this article — https://forextester.com/blog/leading-lagging-indicators-in-trading/
— and it got me thinking. The difference between leading and lagging indicators still confuses me. Some people say leading indicators are better for predicting trends, others swear by lagging ones for confirmation. How do you actually use them properly in real trading? Is it worth combining both or should I focus on one type?