Hi everyone!

I'm a Lazarus freePascal learner, and I liked to learn and program visual projects with C++, I'm Linux Mint user, I downloaded "KDevelop" but I couldn't find resources for learning programming by it and it seemed complex to me, I googled more about GUI IDE's for C++ and found QT and searched for it on Software Manager in my Linux Mint and I found this version like what is in the next explaining image:

My question is how can I start learning visual programming on C++, I want to make some simple projects like "Hello World!" and some small games, I know some C++ alphabet since my using Turbo C++ under DOS? How can I start here, I don't know where is the start point and how can I be guided to learn and understand this new material?