我想学it首先从哪着手

随便那儿 都可以啊 着不是问题
我这有信息:
it
[it]
pron.
它
[域] Italy , 意大利

IT
=Information Theory 信息论

it
it
AHD:[¹t]
D.J.[it]
K.K.[!t]
pron.（代词）
Used to refer to that one previously mentioned. Used of a nonhuman entity; an animate being whose sex is unspecified, unknown, or irrelevant; a group of objects or individuals; or an abstraction:
表示物体：用于指已经提到的事物。用于指无生命物体；性别不详、不知或不相关的有生命物体；事物和群体；抽象物质：
polished the table until it shone; couldn't find out who it was; opened the meeting by calling it to order.
把桌子擦出光亮；查不出是谁；会议开始，全体肃立
Used as the subject of an impersonal verb:
表示主语：用作非人称代词的主语：
It is snowing.
正在下雪
Used as an anticipatory subject or object:
代主语或宾语：作为先行主语或先行宾语：
Is it certain that they will win?
他们一定会赢吗?
Used as an anticipatory subject to emphasize a term that is not itself a subject:
强调主语：作为先行主语来强调，但它本身并不是主语：
It was on Friday that all th