Here's a list of tactics:
http://www.chess.com/article/view/chess-tactics--definitions-and-examples
I'd guess these will be useful to you:
http://www.chess.com/article/view/study-plan-for-beginners-tactics2
http://www.chess.com/article/view/study-plan-for-beginners-strategy2
http://www.chess.com/article/view/study-plan-for-beginners-the-opening2
No offense Macromind but even if Internet ratings weren't inflated you're still firmly in the category of a novice. Work on being more careful (not dropping pieces) and endgames because they break chess into its smallest individual units so you understand how the pieces work in their purest form, such as bishop against a knight with varying pawn distributions and structures, and winning methods such as Lucena and draws such as short side defense, Vancura position, and the Philidor. Work on basic mates such as queen vs. king (i.e., training to not carelessly stalemate without trying), rook vs. king (still very straightforward, even easier than king vs. queen because the chance to carelessly stalemate is reduced, and it's easy even OTB to figure out the winning method since it's easy to logically deduce that you should make increasingly smaller boxes) two bishops vs. king (harder than with the rooks despite being more material than a rook, requires a little finesse).
Finally knight and bishop vs. king, which is the most difficult basic checkmate. Basically you use your bishop, knight, and king to wall off the opponent's king and force it to the same color square as your bishop. Your opponent will try staying in the middle if possible of the board but wind up running to the opposite corner of your bishop (so a light square if your bishop is dark squared), so you need to force it to the other side.
This game from GM practice demonstrates how to win with bishop and knight vs. king:
Cool game, TheGreatOogieBoogie-in-the-sky! That's one the few professional games I've ever seen that went all the way to a checkmate in the endgame, and in a rare B + N mate besides. Did Ljubojevic maybe think that Judit Polgar had forgotten how to mate with those pieces? Or was he just making a permanent record for educational purposes? Pretty unique!
Well, it was a blindfold game, might as well hope she screws it up... I guess.
Cool game, TheGreatOogieBoogie-in-the-sky! That's one the few professional games I've ever seen that went all the way to a checkmate in the endgame, and in a rare B + N mate besides. Did Ljubojevic maybe think that Judit Polgar had forgotten how to mate with those pieces? Or was he just making a permanent record for educational purposes? Pretty unique!
Like Shell_Knight said it was a blindfold game, but still, it's important to learn the basic mates when a novice and certain endgames.
When a novice firmly learn basics such as these checkmates and endgames, scanning for checks, captures, and threats, weeding out hope chess in general, and basic positional understanding to compose at least rudimentary plans in critical positions. If one is in a quiet middlegame and just studies basic tactics and endgames then they'd be unsure of what to do in positions where those skills are invisible.
When you become intermediate then My System is required reading since every coach says if you don't read it you'll have huge gaps in your understanding.
As to your 1...Nc6 defense question just go for a reversed Van Geet from either side and keep what you learn in Pawn Structure Chess in mind from the relevant chapters:
I was wondering if there was a website or book (website preferred) that has a list and accompanying explanation of all/most known accepted chess strategies (all including attacks, defenses, openings, endgames, etc.) like the Nimzowitsch Defense, the Elephant Gambit, and the Sicilian Defense (like a chess strategy Encyclopedia).
And to get an idea of what level I'm at, I played chess for around a decade (although I took a three-year break in between so I guess the total is seven years). Right now, I play purely intuitively and when I play other people who play intuitively, I can usually win. However, I almost always lose when I play someone who utilizes specialized chess strategies so I guess I am intermediate (more on the advanced side of intermediate).