Git clone… NOPE!
You cannot directly download release assets using Git, as Git only handles source code and not the additional assets attached to a release on GitHub. However, you can use a command-line tool like curl or wget to download the assets.
In a web browser go to: https://github.com/wso2/WSO2-Training
Click on Releases on the far right. (Under the About section is Releases.)
Use the search to find the release version you want. For example if you use 4.2 you get API-M 4.2 release trainings.
Now make a folder to store your course. It helps if it matches the same name structure as the GitHub courses.
Right click on each asset and copy the link and then use wget {url} to download the file into your local system. Example wget https://github.com/wso2/WSO2-Training/releases/download/APIM420DFMI/WSO2APIM42DF_MI_CourseOutline.pdf