I want to learn more about forex.
If you have learned all the basics from pipsology, then you can definitely go for a book. I would suggest Currency trading for Dummies.
Did you complete The School of Pipsology of Babypips? If not, complete it. If you have completed it, first read The Disciplined Traders by Mark Douglas.
You can refer to the resources available online or you can read through different books on forex to have a clear understanding of the forex market and its working.