I haven't used the newer version(s) of DPP, and don't know about any updated improvements and/or features in version 4+...
Anyway, I for one have been a steady proponent for using DPP when "getting started", particularly with Raw shooting/processing. DPP gives you a real "look" at how Raw compares to your in-camera/out-of-camera jpegs and the settings that affect how those jpegs come out, and then a "glimpse" of what you may get with a Raw "starting point"!
But then, I jumped into Photoshop with its Raw proccessing "engine" (Adobe Camera Raw), and the amazing tools that are available in Photoshop to work on the "pixel editing level, and Photoshop Elements has inherited a lot of those tools, and is, by the way, an easy app to "get started with compared to the "standard" Photoshop. Photoshop Elements has, by the way a "toned down" version of Adobe Camera Raw, which includes the "Basic" controls, and you can actually get a lot done!
But then, after spending the time and money to get and learn Photoshop, then Adobe announced that they were preparing a new software app aimed specifically at "serious" photographers, and particularly at those of us who were dedicated to shooting and developing Raw images, and then this new app had a "special distinction", which was for those of us who had collected large "libraries, tens of thousands of digital photos, all of which were "parked on our computer systems, and had us sitting there scratching our heads, wondering how the heck do we manage those thousands of images?
And that was the situation Adobe tackled when designing and developing Lightroom. The aim was for "serious" photogs to have something that would not only do state-of-the-art work with their Raw images as well as other image format, and then to give us tools to "manage" and "organize all those dang photos and effective ways for us to get those photos "out" and put them to use!
I will say in an aside, though:
As I waded into my photography and learning how to work with all that stuff, both in digital photography, and then the many results of scanning my old photos, and using "modern" software to work with those images, especially tiff files that my scanner put out!
But in particular, from those early days, I set myself out to read, read, read! Any book(s) I could find, like "getting started in Photoshop" books, and then as Lightroom got started with its Beta version in 2006, well, I grabbed a good "Introduction" by Scott Kelby, and yeah, paging through all the dang books I could get my hands on truly HELPED me to get things started and underway!
And one other significant thing, not just books, bu then, using the Help feature in your software is really a useful thing to get a handle on! This by the way includes Lightroom, because it really does have some very good Help stuff, take some time just to peruse the contents and such and you may be a bit impressed!
Of course, that is all assuming that you don't become an active "User" of the many online resources, YouTube, or say the online tutorials that are available and that have earned some great recommendations!
And, hey, if you have any questions or issues as you wade through this stuff, well, ASK AWAY, POTN has been great for stuff like that! And, speaking of online resources there are other forums dedicated to users, an example is that Adobe has a large Users forum for both Photoshop and Lightroom, it's active and has been a valuable resource over the years!
So, Success to you!!!