The purpose of this study note is to assist young people who have aspirations of joining the Maritime Sector, especially those who are from landlocked countries and disadvantaged backgrounds. I have tried to breakdown complex information to make it easy for them to understand, when they are studying without a teacher, especially during COVID-19 challenges. To be able to do this kind of work, I tapped out from the experiences of ship Masters and teams, people who have spent their lives at sea. The Marine Environment is covered by a lot of practical work e.g., Navigation, Communication, Seamanship and Meteorology. It is therefore mandatory for me to thank everybody who provided ideas to the compilation of this note. Included, is a plethora of Websites and Articles from recognized writers and scholars. References show how their work is appreciated and recommended to the learners. To all of you colleagues, I thank you, I would not have known everything, with your support, we contributed in building a strong Maritime Sector.