TM2 updates for learnOSM - 1st stage feedback welcome

First time I have attempted to update LearnOSM - cannot get Jekyll to work on my Linux Mint system, so a little blind as to how these changes will look. 
I'm intending to update the rest of the section on TM2, but there will probably be a delay of a week as I will have little internet access for a week. 
Any feedback is welcome - I'm probably doing this the hard way, but don't know any better!