The user needs additional information other than the label of checkbox and I have multiple check-boxes adjacent to each other horizontally how should I show the information when the user is about to check the checkbox so that the user understands what is the label and what he is checking.
You can use a hover effect over the checkbox label with the info.
Something similar than this Codepen, but I think hovering the label is enough, the question mark icon is not necessary.
Checkboxes can have multiple label inside them. if you can put the information in sub level of label I think it's a good solution for that. Checkout the link for implementation: Codepen