Step-by-step tutorial of 3D Slicer Extension Module Development Step 02: Interact, Debug & Pipeline YouTube Video Tutorial for Step_02 Bilibili Video Tutorial for Step_02 Step 03: Developer Foci, Neat Blanks & GUI Hello World YouTube Video Tutorial for Step_03 Bilibili Video Tutorial for Step_03 Step 04: Code Style, Method Groups & US Sequence Viewer YouTube Video Tutorial for Step_04 Bilibili Video Tutorial for Step_04