What is most challenging thing in HTML

Answer 1

Thanks

Answer 2

Not get lost while writing the code.

It's easy to remember what you were doing reading the same code the next day, but what if you read it again just a week later?

You must leave comments in the code, be very organized and know where to locate by the structure of your code. It's very important to classify your tags with ID and Class in order to differentiate them.