Must agree with SvenskaZyda. But there is one more factor to point out.

It's has become clear that two accounts have been created by the author to upvote his own guide. Because I am more than sure accounts made only to vote up a guide with clear praise for the guide is either upvoted by himself or a friend. No serious or real voting.

Its pretty good.
Covers the basics
A Good bit of the advanced.
GJ

Thanks for the help! This is my first guide.

It seems there is big lack in explanation for the itemization. I am a Tier 5 Zed player, not a main but more than decent to have played it well in ranked play, so I'd say I'm more than familiar with the Zed mechanics and playstyle. The crit build is not preferred among Zed players as the only crit Zed players will be hoping for is the last basic attack to proc your passive, other than that, you won't need to be basic attacking as he is very ability oriented, mainly his Q. And being a melee assassin who wants to deal crits, you just wouldn't have the time or the speed, Youmuu's won't always be available, which is why Talon crits are much stronger as he slows people allowing him to basic attack a lot more, making him semi ability and basic attack oriented assassin.

I sense you are new to guide crafting and i suggest turning on the C2V (Comment to Vote/Force Comment) so you can receive more feedback from others. Scaling cooldown reduction glyphs are also rather risky on a Zed, because MR Glyphs are always the better way to survive poke from champions like LeBlanc and Katarina during laning phase. Rely on the cooldown reduction coming from your items, you won't be needing so much cdr anyways, and if you need more, Black Cleaver is very viable on Zed.

i suggest putting the guide on hold and revising it before putting it in the public again until it is fully ready. There are three ways for a guide; 1: simplistic, just the build, no explanation topics; 2: Semi-explanatory, where there is a limited amount of explanation, just enough to get buy and understand; 3: In-depth, fully descriptive of each aspect and explaining how to do things and why these things be done. I'm thinking you are more 2 so you should at least pose a little more explanation in areas such as the itemization and why it is effective over others in some situations.

I'm no pro, but hear the advice out.

I LOVE THIS GUIDE, everyone check this out, its really good i learned alot from this