The Blob knot is a strong knot created for joining a light braid line to a large diameter fluorocarbon shockleader line.
Check out the easy to follow step-by-step knot illustrations in the publications:
Fishing Knots – From the reel to the hook:
Fishing Knots & Rigs:
The Fishing Knots Posters:
https://fish-and-bits.myspreadshop.co.uk/all
or
https://fineartamerica.com/featured/1-fishing-knots-andy-steer.html
@AnglingKnots