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Knowledge that is independent of experience, usually involving logical or mathematical reasoning. For example, understanding that 'all bachelors are unmarried' is a priori.

Knowledge that is dependent on empirical evidence or experience. For example, knowing that 'water freezes at 0°C' is a posteriori.

A type of a posteriori knowledge based on observation and experiment. Scientific knowledge about the world, like 'the Earth revolves around the Sun', is empirical.

Knowledge that could be different and is not necessarily true under all circumstances. For instance, knowing that 'it is raining in Paris today' is contingent.

Knowledge that must be true and cannot be otherwise, such as 'all triangles have three sides'. This kind of knowledge is often considered a priori.

Knowledge that is easily articulated, written, or communicated. An example would be knowing the formula for the area of a triangle, $A = \frac{1}{2}bh$.

Knowledge that is difficult to transfer through writing or verbalization. For example, knowing how to ride a bike is considered tacit.

Knowledge of one's own subjective experiences, thoughts, and feelings. An example is being aware of one's own fear or desire.

Knowledge of how to perform certain tasks and activities, which may be difficult to explain. Knowing how to drive a car is an instance of procedural knowledge.