OK, I've been reading this site for a while now, and I don't think there 
are many articles that really help anyone reading them. So, heres a list I've 
made with some advice about becoming a good duellist
 
10) Never dis any card (no not even skull servant). As useless as any card 
seems on its own, with the right cards it could make a great combo. And when a 
player has 200 LP and they have trap hole or bottomless trap hole, and you 
finish of with 'the useless waste of space' is always funny.
 
9) Respect your opponent. Even if they're a noob. I know a 3 year old who 
could hardly talk, but what he could say was 'mirror force' and stuff. He could 
duel! at 3! Never call them crap or laugh at their strategies, they are the same 
as you.
 
8) Keep the deck as low as possible. When you're in a difficult situation 
and you have deck with 46+ cards there's less chance you'll pull 
out a card you need.
 
7) Keep high level monsters low. I have 3 (2 level 7 and one level 6) but 
two of those are fusion material.
 
6) Don't top deck. Whatever you do, do not use every card in your hand 
because you can. Nothings worse than top decking a tribute monster
 
5) Play fairly. If you win, its more satisfying. If you lose, you know 
where your deck has weak spots.
 
4) Do not do anything from the anime. Even if it is viable, the anime is 
for show, not strategy.
 
3) Try combos. See what works and what doesn't and learn from your 
mistakes.
 
2) Duel as many people as possible. Gain experience. Nuff said
 
1) Build your own deck. Don't copy others because they win. And don't let 
other people build yours. You don't learn anything.