Reddit reviews UML for the IT Business Analyst

OK, sure. Please bear in mind these are my own personal recommendations, everyone's understanding and learning styles are different.

Something like this will be very handy for your documentation.
https://www.amazon.com/gp/aw/d/1598638688/ref=pd_aw_sim_14_of_20?ie=UTF8&psc=1&refRID=96RQCVP9B9T0XYWX9G7J

It covers the latest UML version and will stand you in good stead for you future as a BA. I've not read this but it's been on my wish list for a few months and it will be my next purchase. The reviews seem to be pretty positive and apparently it has some case studies within it. This would be ideal for you because you can actually practise your learning using these in preparation for your role. UML is a common buzzword found on job descriptions so knowing it is handy.

The next book I'd recommend would be this:
https://www.amazon.com/Business-Analysis-Malcolm-Eva/dp/178017277X

I actually got this book free with a bcs course I did but I've recently bought it again as a soft copy so I don't have to lug it around with me. I consider it my Bible to be honest. It pretty much goes through the spectrum of BA work across an end to end project lifestyle. In the real world it's unlikely that you would ever need to use all aspects of this book on all projects. The idea of it is more of a reference to pick and choose the relevant parts for the state of your project and apply the BA skills that it describes and the experience you already know.

Finally, there is another BCS book I often use, specifically for gathering and documenting requirements:
https://www.amazon.com/gp/aw/d/1780172737/ref=pd_aw_sim_14_of_1?ie=UTF8&psc=1&refRID=MSPTS21P7KVGTZ0YJ4C5
I used this book a hell of a lot when I first started out and it literally has what it says 99 tools and techniques. Best of all, it has examples and some basic templates to start from. Which were so useful for me.

Don't be afraid to use Google, linked in and the websites listed on here. They are all invaluable sources of information to help you.

It's worth noting that there are a number of BABOK books out there that could be out benefit to you.

None of the companies I have worked for have been particularly bothered about this but it is something I'll study at some point. Anything on agile would be a bonus. Agile seems to be the new buzzword lately.

Hopefully some of the other guys on here will comment too.

Hope this helps, apologies for anything that's unclear, I'm writing this on my phone.

Good luck,
Andy