Well written; excellent analogies.

I've known of indexes for quite some time (nearly 20 years; oh I'm getting old[er]!) and have implemented and used them countless times.

I'm confident I implement indexes reasonable enough (:Whistling:), though will definitely benefit becoming more technically knowledgeable of them.

Starting at Level 1 and moving forward, all the while with the mindset I'm 'learning' something new, will reintro and expand my skill set on the topic.

Thx.