Go from the particular to the general (at least sometimes)
.... the root of the true practice of education must start from the particular fact, concrete and definite for individual apprehension, and must gradually evolve towards the general idea.
Alfred North Whitehead
Depending on their learning style, many learners are happiest starting with concrete examples from which they can extract abstract principles, rather than the other way round. This approach fits well with the principle of active learning and allows new learning to be located in the real world and therefore in the known. Case studies and problem solving are good examples of this.
You may notice that the design of this tutorial does not follow this approach.