Here are some videos on YouTube that can be helpful to understand decimals and how they work!

https://www.varsitytutors.com/aplusmath/flashcards/multiplication

Review of decimal place values
Comparing Decimals. Remember to line up the decimals!
Step by Step on how to compare decimals! Remember to line up the decimals!
This is a great video explaining the process for comparing decimals. The one thing it does not do is show using a Place Value Chart to help compare and order decimals.