What are the topics\websites\usecases for pumping skills in interface prototyping?

Question

Layouts and prototypes

To master the field of prototyping and interface design, even using one of the most popular tools for this - Axure Pro, what tasks can you advise?
What are the sites, use cases, themes, blogs, networks, where you can get an idea for thinking and just designing interfaces for yourself (try, upgrade, well, for your portfolio)?
Usually, designers of this level are approached by good customers with real projects, but if there are no customers, then what to think of, what interface to come up with in order to try to implement it and show it in your portfolio?
Yes, many will argue, like AxurePro is not the only tool in this topic, there are others, even the same Adobe Experience Design CC (formerly Project Comet), although it is at an early stage of development, but still. What is more in demand on the market and what are the trends?
And what tools do you, dear gentlemen, professional interface designers use? Do you use other products? What is more in demand? And remember, on your development path, when there were no customers yet - what did you invent, what interfaces did you draw and design in your portfolio of works, replenishing your portfolio? Share your advice, please.
Thanks in advance.

Answer 1

Egor Kamelev talks and teaches well about Akshur:
projectorat.ru
https://www.youtube.com/user/Ekamelev
I worked closely with Akshur. He has great potential. It seems like you can prototype pretty complex stuff in it. But unfortunately, Akshur will not give this - he starts shamelessly glitching and slowing down when trying to use it to its fullest. As a result, most of the time starts to go around the strange and unpredictable bugs of the program. For simple tasks, it will fit perfectly. I do not discourage him - a very, very powerful tool with a great future. But it is better not to prototype complex interface logic in it yet.
If you want to master akshur and the field of interface design itself, try to design a popular service: an online store, a blog, or at least the same toaster - repeat and improve.