linked double crochet, invisible seam/ invisible join and how to decrease

Instructions on the linked double crochet (LDC).
How do I make an invisible seam when working in the round by closing the round en how to make decreases by crocheting 2 LDC together.
I use these techniques in my upcoming patterns.

[@luyanda6703]

Thank you so much this really helped me a lot in achieving a perfect seam when using a linked double crochet 😊