I said inset the sides. He already had support on the front part, and your example seems to be missing needed support anyway, so it's not surprising it came out that way. Inset is correct here because of topology rules. Like that, with those other parts inset yes, indeed it's wrong, so it's really good you show the…
Like so: Not the best but you get the idea Edit: @mortalhuman: Please don´t use inset it almost every time fails to get the result you really want As you can see here:
If you make sure a loop goes around all the hard edges of models, they always naturally have places for loops. That is the true correct way to do it. I think insetting the sides will work here. Maybe twice is needed, since there are ngons. That will give you the loop around the edge that you need, and any messyness will be…
I don´t know where the triangles are in my example but i suggest you take a better look it´s completely made of quads (not beeing offensive here) ;) And if he did it the "right" way he should be using inset for anything(supporting edges related)
Like Pior said - take the time to read that thread. It's huge, yes, but it's invaluable. Although keeping quads is very important, there are times were Ngons are perfectly fine. The main problem you have in that example scizz, is that your edge loops are incomplete. You were doing just fine, but it looks like you stopped…