[Newbie question on terminology]

Thanks very much, everyone.

I have another one (and it looks like I'll have tons more). Not sure if I should post it here though. Probably it's better idea to create a new topic... ???
Anyhow, here it is, where to find basic description of components? I mean function, purpose, basic schemes how to use, etc.
I.e. what is "latch"? How it works? Where, when and what for should I use it? Or what for and when should I use "octal 3-state transmitter/receiver" like 74CT244? What is "3-state" (I suppose 0, 1, Z)?
I'm trying to create some device on DSP, but when I look on schematics, I don't understrand lots of things, so I have to learn it, therefore I need you help.
I have some knowledge, but it's waaay too outdated and basic.

Thank you in advance,
Any info like web-links, book, or just "directions" where to start/look whould be very useful.

[Newbie question on terminology]

Hello everyone,

I'm a complete newbie in microelectronics, please, don't laugh too much. :)
What does "high-impedance state" mean exactly?