....he explained is that you can use a chord based off the note before or after the note you want to go to. He also explained that you can use the note a fifth away from the note you're going to as well.
That is correct MrAndrew 
You can also use a note/ chord that is a 4th away from the note/ chord you are going to.
The optionas are really endless.
Hmm, well MrAndrew & Mus, maybe about serveral months ago, i had an epiphany about "passing chords", and posted my curiosity of what i thought i discovered over at
"Hear & Play".
Basically, something that i never realized that i accidentally discovered is that:
"ALL DOMINANT CHORDS" can be successfully used as passing chords as the 5, or the
tritone substitution, which would be like the b2(#1) heading into the 1. Some may say that the dominant 5 chord is not considered a passing chord "technically".
Well, whether that's "technically" correct or not, it doesn't matter to
ME. That's just semantics, because the SOUND of it, is what i deem a "passing chord", because it's a "connector". And if it's good, it's
"SWEET nectar"!I already knew how effective diminished chords were in "connecting chords" together. But i had never realized that dominant chords of
ALL KINDS could "connect chords" just as easily, effectively, and even more plentiful & colorful, than diminished chords!

Which means (like Mus said), the possibilities are endless!
And check this out, while typing this post out just now, and thinking about it after reading what you two just touched on above, it looks like if you're going to the 1, then you're able to successfully use:
1) any
dominant off the
5 (which would obviously keep it a dominant chord)
2) any
dominant off the
b2(#1) (which is a tritone substitution, and which would also keep it a dominant chord)
3) any
b5 major off the
4 (which would make it a dominant chord)
4) any
major off the
4 (which would make it a suspended chord)
...all going to & "connecting" you to the 1.
If anyone find any holes in my little discovery, feel free to mention it. Or if anyone wishes to add to it, then feel free to do so. And, if you do add to it, and it's something really good, i'm gonna definitely commit sin and STEAL it!
