To get an idea of the basics of biology I think it would be a good idea to read the wiki page on it. Here is a copy of the introduction for convenience:

“Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy. Biology has many subdisciplines unified by five so-called axioms of modern biology:

  1. Cells are the basic unit of life
  2. Genes are the basic unit of heredity
  3. New species and inherited traits are the product of evolution
  4. An organism regulates its internal environment to maintain a stable and constant condition
  5. Living organisms consume and transform energy

Sub-disciplines of biology are defined by the scale at which organisms are studied and the methods used to study them: biochemistry examines the rudimentary chemistry of life; molecular biology studies the complex interactions among biological molecules; cellular biology examines the basic building block of all life, the cell; physiology examines the physical and chemical functions of tissues, organs, and organ systems of an organism; evolutionary biology examines the processes that produced the diversity of life; and ecology examines how organisms interact in their environment.

A link to this page can be found here.

Apart from being very informative this wiki page also breaks down biology into 5 main interests or ‘axioms’. This is very useful as it allows me to study each axiom separately. If I tried to study biology without the axioms I would get easily overwhelmed, now at least there is a better chance I won’t.

“Develop a passion for learning. If you do, you will never cease to grow.”
— Anthony J. D’Angelo