The sidebar has a Books and Resources list, I suggest looking there for suggestions.

A reply to /u/karabekian77

It's really great that you and your wife are committing yourselves to studying world history! It is a vast subject and if I may suggest, you need to tell us more about yourselves so that we can give more specific advice.

Are there topics you are curious about? Middle eastern history? The Roman Empire? The Sengoku era in Japan?

What are some of the books that you have really enjoyed, even outside the purview of History? What makes you like them? That they are systematic? Or that they have compelling background stories? Or that they have great characters?

The best way to learn is to choose a path that is rewarding and keeps you interested. I like systematic studies first, and then to see how various figures thrive (or put themselves into spectacular failures) in particular eras. So if I had to "start over again", I would start with Fernand Braudel's "A History of Civilizations" from the 1960s, which was a challenge to the way History used to be presented, which was purely focused on heroic actors. Rather, Braudel talked about the nature of things, climate variations, the seasons, the system of trade, how peoples engaged with each other.

I may consider at the same time to choose a book or two from the AskHistorians Book List: General History linked from the sidebar, continuing to more specific subtopics as appropriate. Further, I may look at the Flairs Profiles pages. Find flairs that are interesting to you and see if they have any good recommendations on their pages.

So, start by exploring and discovering things that you like. Read through the relevant FAQ sections. But really find things that you like to read about, and ways that you like to learn.

Of course, if you have further questions, feel free to ask here. Good luck and have fun!