Sketchup is better if you just want to start modeling, AutoCad is better if you want precise modeling that you could use for a CNC machine or 3d printer. However, both use deliberate geometry and triangular mesh so as to not distort the shape of something, which means the shape of an object takes more work to design. Compared to something like Blender which is free btw, that typically uses a square mesh, allowing for a less precise, but more artistic modeling style, because its more like molding clay than designing a schematic. Examples. To model a Character or natural object. Blender. To model car parts or electronics. Autocad. To quickly model a house or other structures that pop into your head. Sketchup. One added side note, Sketchup has a very large developer and designer community so you have both the extention warehouse and 3d warehouse to download models and tools to use. I personally enjoy using Vanilla Sketchup the most, because I am the type of person to have ideas pop into my head, and I want to design them in a relatively short amount of time - but I also have muuuuuch larger projects in Sketchup, and t are easier to manage because sketchup is light enough and quick enough that it doesn’t overwhelm my computer. Happy modeling.
And here are some helpful references. “ The above PDF files may be used in some following programs,” in Adobe Reader,” in Adobe Acrobat Reader,” in Word Perfect,” in Adobe Illustrator. If you want to have your book,” the size of a normal book,” with more than 600 pages added into your computer's file system,” and also to do it permanently, or” to save it for the future,” you will need to convert the PDF in a way that it can be saved. You will have to read the conversion and conversion information to understand the process. The most common formats of PDF are plate/ADF and word, the latter for creating the book for e-books, etc. In those programs, you can add references to those books to make the PDF more searchable and/or for future reference. Now the information about converting PDF to different formats.