Joining endpoints--I'm still not understanding this basic thing

I could really use some help.

I'm still struggling through Nikita's industrial tool course. Each time I start over (I'm trying to be very precise), I have the same basic, recurring issue: joining endpoints.

1) How do I join these points for building lofting guides?

2) I've noticed that when I start a new curve at another curve's endpoint it will be green, but where I end the new curve at another endpoint it will be purple.

3) I thought Purple meant "Not Connected," yet when I attach purple endpoints using Control+Click I can use the Join command on the two curves and make one curve. So... what does Purple mean? What does green mean?

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