I see a lot of こと. I know its meaning but sometimes I see it and it simply doesn't tell me anything. Is there any website or article that could show me how I use it?
ことis used frequently as a nominalizer - ことmeans "thing [that you do or is intangible]" itself - and can be used to turn something into a noun (nominalization). With regard to verbs, ことcan be use with the dictionary form of a verb to form the gerund. For example:
食べることが好きです。(I like eating) [Literally: (the act of, the thing of) eating is pleasing/likeable]
Although I suppose a better way to say this may be 「食べるのが好きです。」, the nominalizer こと tends to indicate something that the speaker does not "feel close to" - where the nominalizer の does tend to indicate that the speaker is personally involved.
Check out nominalization and relative clauses for more information.