Dear Ayoub Najem thank you for your interesting technical question. Ideally, the person at your institution who runs the NMR spectrometer will give you a personal instruction or perhaps offers a course. It's not a matter of half an hour to learn NMR spectroscopy, especially when it comes to characterizing complicated biologically active natural compounds.

On the general internet you can easily find a variety of free courses and tutorials when you search for "Introduction to NMR spectroscopy", including YouTube videos.

For example, please have a look at the following useful links:

INTRODUCTION TO NMR SPECTROSCOPY

https://www.structbio.pitt.edu/images/sbl2014/notes/nmr_ref_notes_2011.pdf

This rather comprehensive introduction can be freely downloaded as pdf file.

Introduction to Nuclear Magnetic Resonance

https://application.wiley-vch.de/books/sample/3527312404_c01.pdf

Basic Introduction to NMR Spectroscopy

https://www.youtube.com/watch?v=CH-4TtZSvY0

and many others.

Good luck and please stay safe and healthy! 👍

The is no one point solution to your problem. NMR is a philosophy and there are various facets to this technique. Physicists and bio-physicists perform research on methodology, others work on applications. If you are interested on the use of NMR spectrometer for problem solving only, there are several things that can be done:

1. there were how to do YouTube videos (but they may not be sufficient or rather dangerous to apply on your instrument directly, without the knowledge of your lab manager

2. If your need is to have a background of NMR experiments, there are several standard texts like T.D.W. Claridge High-Resolution NMR Techniques in Organic Chemistry, 2nd Edition (elsevier.com)

3. Some excellent basic NMR courses on YouTube are by

a. (Late) Prof. H. S. Athreya, Indian Institute of Science, Bangalore, India

b. Introduction to the lectures series "Understanding NMR spectroscopy" by Dr James Keeler

Best wishes

Like everyone has said, to understand NMR on a deep level, you'll need to enroll in a course. However, here's a few sites with problems that I have found to be good practice:

https://webspectra.chem.ucla.edu/

http://www-usr.rider.edu/~grushow/nmr/NMR_tutor/selftests/problems_fs_start.html

Hope this Coursera platform would help you also get into the fundamentals of NMR.

https://www.coursera.org/learn/spectroscopy

NMR is a huge area and it takes years to master even a small part of it. I'm guessing that you are more interested in interpretation rather than the physics of what makes NMR work. There are excellent books but they cost money. Perhaps you could get your institution to buy a book? Maybe they have one already in their library? I like Tim Claridge's book which gives a good idea of what experiments do. At the risk of plugging my own work (and that of my colleague), you could consider "Essential Practical NMR for Organic Chemistry", which is focused on interpretation. Note, however, that natural products can be very challenging, even for experienced NMR spectroscopists. Good luck!