Don't forget how to bust certain unorthodox openings. Be the player who plays the lines that Grob and Borg players fear! Sometimes a bust might be counterintuitive, thus the need for some study. I usually play 1.d4 as white, but wouldn't want to lose to the Englund gambit or Budapest, and seemingly sensible developing moves in the Budapest are greatly punished, and I know when to throw in the feared a3 as white. It isn't a refutation per se, but does put the breaks on black's trappy plans.
Removing the Noise #3 - Choosing an Opening Repertoire

Don't forget how to bust certain unorthodox openings. Be the player who plays the lines that Grob and Borg players fear! Sometimes a bust might be counterintuitive, thus the need for some study. I usually play 1.d4 as white, but wouldn't want to lose to the Englund gambit or Budapest, and seemingly sensible developing moves in the Budapest are greatly punished, and I know when to throw in the feared a3 as white. It isn't a refutation per se, but does put the breaks on black's trappy plans.
This is an interesting point but I would be reluctant to reccommend people do this.
You are totally correct that there are unorthodox openings that can punish normal developing moves, however, in terms of benefit/time you are rarely going to see these openings and dedicating time to them is not a good idea.
Instead time should be spent on the main lines of openings and getting familiar with the strategies and ideas within them.
When someone does produce an unorthodox opening, use opening principles and just be careful of traps and checks. Once the game is over if you went down in the opening just review the game and make sure you don't make the same mistake twice

For many lines it usually doesn't take too long. The closest thing the wing gambit has to a bust is easy enough to learn in under a minute: 1.e4,c5 2.b4,cxb4 3.a3,d5 and black grabs some initiative for himself.

For many lines it usually doesn't take too long. The closest thing the wing gambit has to a bust is easy enough to learn in under a minute: 1.e4,c5 2.b4,cxb4 3.a3,d5 and black grabs some initiative for himself.
Agreed that the bust can be easy to learn, but rather than learn all the possible responses and then all the counters it is better to just concentrate on the main line and then learn the response to the unorthodox opening once you have faced it. More efficent this way
Removing the Noise #3 - Choosing an Opening Repertoire.
In the last RtN the reasoning behind studying the opening was investigated and it was linked to the concept of planning. A methodology of learning the strategic principles behind the opening was developed.
http://www.chess.com/forum/view/general/removing-the-noise-2---why-study-openings
When choosing an opening repertoire to foster improvement, several criteria must be met.
These criteria will allow an optimal opening repertoire for any improving player who is beginning to look at planning and openings.
Here are some openings I would recommend
Queen’s gambit both sides
Indian Defences’
Ruy Lopez
Italian Game
If you decide to play 1.e4 you should learn something about the Sicilian defence as well.
Next article RtN #4 - How to build and practice your opening repertoire