You can do training about a certain field you want to pursue in. Then after that do internships related to the same or related to that course. Whenever you make your CV always make it in bullet points and the longest the internship, give more value to that internship. Talk more about it . Also whenever the HR ask about you always keep at least 5 points that are not mention in CV
A good course to enhance your CV totally depends on your background and the job you are applying for. You can visit Coursera and Udemy sites and choose the domain you are willing to apply to and then search for relevant courses. Most of the courses have on these platforms have ratings and will tell you whether people have liked it or not. This will help you decide whether you should be pursuing it or not.
That totally depends on you educational background- the courses you’ve undertaken, the industry you’re looking forward to enter or are currently working in. Google has a bunch of free online courses which you can check out.
best online course by professional also give certificate on completion of course ,live doubt session , personal mentorship , demo videos before buying courses , lifetime access no fixed time for completing course and cost effective course