Summarize:

To see SketchUp's latest features and suggested actions, click the blue Start tour button in the middle of the page, then follow the on-screen prompts. You can also skip the SketchUp tour by clicking the Start modeling link. Click OK when prompted about cookie use, then check the "I agree to the terms of service" box and click OK. On the left side of the page, you'll see a vertical column of icons. These icons, from top to bottom, pertain to the following tools:   Select — Allows you to highlight (or "select") an item.  Erase — Allows you to remove a highlighted (selected) item.  Paint Bucket — Allows you to fill an item's surface with a color of your choosing.  Draw Lines — Allows you to click and drag to draw a straight line.  Draw Arcs — Allows you to click and drag to draw an arc.  Draw Shapes — Allows you to click and drag to draw a specific shape (e.g., a triangle).  Modify Objects — Allows you to change the model's surface (e.g., extend the surface) by clicking and dragging.  Move Objects — Allows you to move (via clicking and dragging) an item.  Measure Tools — Allows you to measure an item using your preferred dimensions.  Walk — Allows you to view your creation from eye level.  Camera Controls — Allows you to change the camera's settings for different viewing. On the right side of the page, you should see another vertical column of icons. This is the "Panels" menu; from top to bottom, each icon relates to the following:   Entity Info — Shows information about the currently selected object (or "entity").  Instructor — Gives you tips about using SketchUp.  Components — Allows you to search for specific 3D model components.  Materials — Lets you select different materials for painting your model.  Styles — Shows different styles of modeling.  Layers — Shows the different layers in your project.  Scenes — Shows different scenes (e.g., variations) of your models.  Display — Brings up settings for your project. You'll find the status bar in the lower-left side of the screen. From left to right, the options here pertain to the following functions:   Undo — Removes the last action.  Redo — Reapplies the last action.  Help — Opens a menu with advice for your currently selected item.  Language — Allows you to change the on-screen language.  Feedback and Status — Both of these options provide different pieces of information about selected items. This will allow you to shift your perspective somewhat, though you'll need to use the camera tool to rotate or pan right or left. In the lower-right corner of the page, you'll see a set of dimensions pertaining to your currently selected area. This will help you ensure that your creations are precise when necessary. If you want to save a copy of your file in SketchUp's cloud storage, you can do so at any time by doing the following:  Click SAVE in the upper-left corner of the page. Enter a name for your project. Click the TRIMBLE CONNECT tab on the left side. Click the SketchUp folder. Click Save here in the lower-right corner of the window.
Consider taking the tour. Complete the setup. Review the tools and their uses. Know what the panels do. Check out the status bar. Scroll up or down to zoom in or out. Find your project's current measurements. Save your project.