what is a mercenary?
A mercenary is the legacy term used to refer to overseas security consultants or contractors who perform military-like work for pay in the private sector. These individuals are typically trained soldiers (or trained in support of security personnel) that work for a private company or non-governmental agency.
A scholar is a specialist in a given branch of knowledge. A scholar is a learned person who knows a particular field of study very well; someone who has great knowledge and has extensive research in the field. To become a great scholar you should do in-depth research and it is not just about managing research but how you individually do your research.