SketchUp is a 3D CAD conceptual modeling program used by designers everywhere for architecture design, engineering, landscape design, modeling, etc.  It is not as great at creating models for 3D printing or manufacturing but it is good at quickly conceptualizing photo-realistic ideas and has a massive library of pre-made objects.

There is the basic free web-based version ( Create account using TKS gmail info: https://edu.sketchup.com/  and enable pop-ups in the web browser), or a basic free desktop version you can download from Self Service,  and a pro-version that costs money  https://www.sketchup.com/  

Here are some tutorials to help you learn how to draw in SketchUp:

• The official SketchUp tutorial YouTube Channel: https://www.youtube.com/user/SketchUpVideo

• Basic Drawing Tools and Methods:    https://www.youtube.com/watch?v=0cmI-XLgyoM 

• Basic Drawing and measurement tools:   https://www.youtube.com/watch?v=_sGIZg3q9wA

• How to turn house floor plans into 3D models:   https://www.youtube.com/watch?v=j2Zxep6wuKg

• How to make a coffee end table:   https://www.youtube.com/watch?v=zpdMZK6LlDE&t=349s

• How to use online version of SketchUp  

• Learn Sketchup in 10 Minutes

• Another one for Sketchup in 10 min

• Full set of tutorials from beginner to advanced

• From paper 2D floorplan to 3D walls

• Build basic house in online Sketchup

• Watch this video at a fast speed which teaches Sketchup landscape design skills. 

• How to create Scenes to create a Fly-Through video of your model and landscape:  Once created, then use QuickTime > Screen Recording feature to record the fly-through on the screen for the video. Import into iMovie, add music and text to make a promotional video to share.

Search the  Components > 3D Warehouse tab > for millions of pre-made objects to place into your SketchUp Designs.

And there are so many more tutorials in youtube!    https://www.youtube.com/results?search_query=sketchup+tutorial