When your character levels up you can put points in the different skills of your char. One of them is Crafting Skill. Is it worth to put points into that skill as you go? It depends. I personally would say to not put points in Crafting Skill in your normal gameplay. You can utilize those levels much better in stats like movement skill or weight.
When you plan on crafting from a quality blueprint on the other hand I would suggest resetting your points with the mindwipe tonic and then allocate all points into Crafting Skill temporarily. That way you can make (what we call) a “Crafting Character” that uses the full potential of the Crafting Skill while crafting. Once you are done, you can reset your points with the mindwipe tonic again and allocate the points like you normally would. If you want to know how the mechanic actually works, I have made an in depth article about “How the Crafting Skill works.”