POPULAR WRITING MISTAKES

Hello, everyone.
In this section, I plan to include examples and advice to help you avoid some of the most common writing errors.

How about this one, specially Vs especially? 

Here's a link which explains the difference simply and clearly.

http://blog.esllibrary.com/2014/11/06/especially-vs-specially/

Or economic Vs economical?

http://dictionary.cambridge.org/es/gramatica/gramatica-britanica/economic-or-economical

I hope that's helpful.
Tom.