The course is for all abilities, but prior knowledge of Technical analysis and trading would be advantageous but not essential.
You will need a Technical Analysis charting package that allows you to utilize Japanese charts such as Renko and add indicators and tools on top of these charts.
If you don't have this, don't worry we can point you in the right direction within the course (the free intro Section 1 covers this).
If you just want to learn about Renko for purely educational purposes and don't want to apply it practically then you won't need a Technical Analysis charting package.