how i can zoom in the viewport in blender?

To zoom in the viewport in Blender, use the mouse scroll wheel to zoom in and out when hovering over the 3D Viewport. Alternatively, press the '+' key on the numpad to zoom in or '-' to zoom out. You can also hold Ctrl + Middle Mouse Button and drag up or down to zoom. If you're using a laptop without a numpad or scroll wheel, you can enable 'Emulate Numpad' in the Input settings or use the View menu in the 3D Viewport header to select 'View Navigation > Zoom In/Out'.