All the dictionaries I have say that the word "information" is usually used in combination with "on" or "about". However, when I Googled with the phrase "information of", there were a lot of hits. ...
Normally you'd say "important information" or "urgent information", but the of form is a well-accepted formal phrasing. You might try to use it to indicate owner of the information, but that's really awkward. "The disk contains information of Sony on their newest mp3 player" - but I don't think you'd ever encounter it in real life.
I thought information is singular and plural. But now I'm not sure which version is right: The dialogue shows two important informations. OR The dialogue shows two important information. Which ...
The information refers to a specific set of information; that which the speaker obtains from fish. The oceans refers to the oceans of the world. Fish refers to fish in general.
Which is grammatically correct? A visit was made to local supermarket to observe and collect information for/on/about the fat contents of vegetable spread and butter available in the store.
All this information is correct. The sentence is absolutely correct. The word "all" has been used as a predeterminer before the determiner "this" followed by an uncountable noun "information". The pattern predeterminer + determiner + countable/uncountable noun is grammatically correct.
This booklet provides useful information about local services. Whilst Helpful, is the willingness of somebody or the usefulness of something to help you achieve an objective. You should find this guidebook helpful. useful; effective; helping you to do or achieve something: Cambridge English Dictionary