A videos outlining the whole structure:

• version 1
• version 2

Short videos on:

• Join
• Separate
• Part-Part-Whole
• Compare

Longer resources on:

• JRU vs PPW-WU
• JRU vs SRU
• JCU, SCU, CDU
• PPW-WU and PPW-PU
• CQU vs CRU
• JSU and SSU