Yes, if you have completed courses on LinkedIn, add them to your resume. The courses show potential employers that you are committed to developing your skills and capable of independent learning attributes that most employers look for when hiring! They can be added to your resume easily and even your LinkedIn CV, so everyone can see the skills you have to offer!
It's best to list complete courses as you will be able to discuss these easily should a potential employer ask about them. We would order or include only the most relevant courses to the job you are applying for. It shows employers that you are committed to your professional development and focused on their field.
In some cases, you might have a few different resumes with different courses highlighted. Or you could break the courses down to relevant LinkedIn courses and others you have completed too. Either way, they should be on your resume!