Facts and Opinion

Fact - A fact is somebody that is true or something that can be proven.
Opinion - An opinion is something that somebody thinks/believes but cannot necessarily be proven to be true. An opinion is based on personal judgement or belief.

Example of a fact - The hospital has 100 beds in all departments.
Example of an opinion - There are not enough beds in the hospital.

Bias - Bias is an unfair judgement on something. This could include giving your opinion on something and then publishing it such as in the news.

Primary Research - Your main research. This is research that you create or take out yourself.
Secondary Research - This is research using existing information.

Example of Primary Research - Primary research includes things such as tests you could carry out.
Example of Secondary Research - A giraffe is the tallest horned animal ever to exist.