I think learning is a difficult topic as it is extremely individual and is also one of the most important skills to have. Moreover, learning is a process as well, and in order to become a skilled learner you need to not only try different methods but also be able to evaluate yourself in a good and non-discriminate way.
I try to use lectures on YouTube as a form of podcast, where I can listen to the lecturer while doing other things. I think this system is very good when it comes to most of the historical philosophical and social sciences; sometimes, it works okay for economics as well. I have not tried too much to listen to technical, mathematical, or engineering lectures.
Motivation for me is being able to intrinsically make the right decision. This implies that motivation is not driven by external factors in this definition. By removing external factors, motivation simply becomes a function of want and mental energy.
Here i list the talks I have heard or found intersting. It contains some of the cool and intersting talks that I hear. Some might be interesting.