That one is a little dated and only really explains leve crafting but what you do is relatively simple.
First find out which crafting class you want to level and go here
. Filter the results by class and order=rank. Keep in mind though that some of the recipes on that list are dated and you can't find the materials for because of the recent changes in 1.19 patch.
As an example lets filter the results to armorer
. Now the best way to gain EXP in a craft is to pick a recipe that is 5-10 ranks above your current rank with 5 being optimal. Try to pick a simple recipe, in this example we will use Copper Ingot.
First thing you will notice is that there are two sets of results with a (P)rimary tool and (S)econdary tool. In the case of Primary tool being used you'll notice that if you HQ it, it will yield more ingots of normal quality. The secondary tool will yield only one ingot but they will be +1, +2 and +3.
The key is to get the progress bar to 100% to finish. You still gain EXP if you fail but not as much as you would have by finishing it. When grinding out EXP your best course of action is to hit standard and keep hitting standard every step of the way. My best advice is to hit standard on solid colors like white, red and orange. If it's a blinking orb I'd advise you to hit wait until you get a solid color again but not to hit wait more than 3 times.
Rapid is used when you're above the recommend level so you can quickly finish it and move on to the next recipe.
Bold(which is now labeled as Careful) is used to get as much quality as possible.
Quality is the potential of the item being HQ(high quality). The more quality you finish with the better chance it has to HQ. As mentioned above there are two types for parts. Bigger yield or a + version. It's all random so keep that in mind. Just because you hit a certain quality and hit HQ doesn't mean you'll hit HQ again with the same quality. It only improves your chances.
Those are just parts however, when crafting a piece of gear it's slightly different. The same ideas apply but there is only one group of results. There is the normal item and then + versions. Quality rules sill apply here, however when you reach the end you will have a choice of "Touch up". I'm no expert on this, anyone feel free to correct me, but I believe touch up is basically trying to hit the HQ item.
In the end the best you can do is get in there, get a feel for it and try to enjoy it.