CLAMS is also a handy tool for the hobby welder to learn along with some other basic terminology.
GMAW is where this post originates from, the video linked is a common instructional tool in some welding schools.
WIKI link to a Fillet Weld.
"The macro etch test can provide some excellent feedback especially when it is done immediately after welding, while the image of the puddle is still in the welders head."
Macro Etch.
With any type of welding the most important part is practice.
HAPPY WELDING !!!