Learn System.out, System.in, and how to create a Scanner to read keyboard input.

Declare and initialize variables with types like int and double.

Use final constants and Java naming styles: camelCase, PascalCase, and ALL_CAPS.

Apply augmented assignment operators such as += and *= for concise updates.

Understand pre- and post-increment and decrement with ++ and --.

Walk through a full program that reads base and height and prints triangle area.

Recap I/O, variables, constants, naming, and shorthand operators.