How should I list the conferences and courses I attend as an undergrad student to my CV? This is not really a duplicate of this question: Should I list conferences I attended on my CV?

I just finish my bachelor and trying to apply to a grad school. Of course, my CV is weak and strong LORs are what I should count on. However, I do want to strengthen my CV, so I want to list some conferences and courses that I have attended. So far, I have attended:


A specialty workshop held in my university. Actively helping behind the scene (put letters into envelops, be a reception, etc). Unfortunately I don't remember exactly the detail, but I can seek for help.
An international flagship conference held by a reputable institute in my country. I just sit back and listened, and unfortunately didn't register to attend.
An annual conference held by my university. This one was opened for any specialty, and I had a poster presentation in there.
An course taught by an invited professor from Germany, with h-index was 36. This course was organized at the same time with the workshop.


Should I list them down to my CV? How should do it properly?
Yes, I would suggest you include these in the CV for a graduate application.  It probably won't make a huge difference in admissions, but it is evidence that you are interested and involved in the research community in your field.

You can list them in any way that seems appropriate; there's no strict standard format for a CV.  You probably have sections for "Education" and "Work experience" and maybe "Publications"; make a similar section entitled "Conferences attended" or "Conference participation" or something like that.  Include the title, date and location of each conference, and maybe a short sentence discussing the scope of the meeting and your role.

(As discussed in the question you linked: later in your career, you will probably want to take this section out.)