If you ever wanted to learn General Relativity, now here's your chance. The caveat is that first you must learn differential geometry. But it's not difficult, really. Only lots of hard work, but not difficult. I was attending this February such a course. This course is fully documented: there are recordings of all lectures, and of tutorials with solutions (also the .pdf files with practice questions). For easier access you can also visit the The WE-Heraeus International Winter School on Gravity and Light YouTube channel.
You should know though that this material on the internet is not everything we were doing there, the biggest omission are the advanced tutorials, which were done in groups and couldn't be filmed. Also their solutions were too difficult to be "quickly" filmed like the tutorials that have videos. However there's hope that advanced tutorials will also be put online some time later this year (as promised by the organizers). In that case I'll submit a follow up story.
I must tell you that attending this course was really a great experience, and Prof. F. P. Schuller is in fact on of the best lecturers I have ever met.
(Score: 1, Informative) by Anonymous Coward on Tuesday April 07 2015, @05:01PM
For great lectures pertaining to geometry and relativistic measurments you may also like to view some of Prof Wildberger's YouTube videos:
WildLinAlg37: An elementary introduction to Special Relativity I [youtube.com]
and Bats, echolocation, and a Newtonian view of Einstein's Special Relativity [youtube.com]
There are _many_ other great lectures in about ten playlists.