Career

Hi Sagar,
I think, you should go for Fashion designing if you are interested. One should always work in the area or field which they are interested in.
And fashion designing is all about apparels, from their sketches to their construction, embroidery to their pattern, production to sales, photoshoot to marketing, exhibition to fashion weak.
It doesn't matter that how much you know about fashion once you start the course. They will teach you different aspects of fashion and designing garment.
NIFT (National Institute of Fashion Technology) is the best college to pursue for Fashion designing in India. It's a government college which offers Bachelor's programme as well as master's programme and the short Diploma course. You can choose any of the programme.
The eligibility criteria for these different programmes are-
1 - For B.Des, you should be under 23, with a score of 55% in your 12th class in any of the stream. (For SC, ST and differently able the age limit is relaxed by five years)
2 - For M.Des, you should have a minimum 3 year duration degree in design from a recognised college.
3 - For Diploma course you should be 12th passed.
All the best!

You may think of the following courses depending on the qualifications you already have:
1. If the current course is done after doing graduation then a Post-Graduation in Mass Communication/Mass Media/Media Production can also be good for you. I shall not hesitate to suggest even a Master Degree in A Language- English, Hindi or the one you see as an additional strength for editing and proofreading works.
2. If one does Certificate in Proofreading and Editing after class 12th, pursue Graduation as a must to do thing. Any Stream you may choose keeping in mind that an Alternative Career has to be met openly. Proofreading and Editing Job can also be a part-time thing so you have enough time to do another degree or Higher Studies.
3. If this Certificate Course is done by someone who is a Master Degree Holder, if not in Language or Social Science, Humanities, do one degree.

Audio-video editing is technical learning and will need some language and other mass media skills to bring growth in career.
The certificate you are pursuing in editing and proof reading is a good way to join the media jobs, as content writing and content editing-proof reading is quite a good career. From media/journalism writings to website developments, this task has a role.
You may think of the following courses depending on the qualifications you already have:
1. If the current course is done after doing graduation then a Post-Graduation in mass communication/mass media/media production can also be good for you. I shall not hesitate to suggest even a Master Degree in a language- English, Hindi or the one you see as an additional strength for editing and proofreading works.
2. If one does certificate in proofreading and editing after class 12th, pursue graduation as a must to do thing. Any stream you may choose keeping in mind that an alternative career has to be met openly. Proofreading and editing job can also be a part-time thing so you have enough time to do another degree or higher studies.
3. If this certificate course is done by someone who is a Master Degree Holder, if not in language or social science, humanities, do one degree.

Non-linear editing is a specialisation domain, and there may be many things that you will need to keep learning along with the production learning.
The suggestions that I can make are:
1. A degree in a popular language that shall be used in your works and place.
2. Content writing and proof reading.
3. Web development and digital marketing.
4. Music and sound mixing basics/audio production.
5. Advertising and public relations management.
The decision depends on how much time you get free from the work of learning documentary production. When you say that you are learning the production of documentary-I take it as a comprehensive work that is itself a time-taking thing and might not allow you to venture for more.

Documentary production/cinematography is a specialisation domain, and there may be many things that you will need to keep learning along with the production learning.
The suggestions that I can make are:
1 A degree in a popular language that could be used in your work place
2 Content writing and proof reading
3. Web development and digital marketing
4. Music and sound mixing basics/audio production
5. Advertising and public relations management
The decision depends on how much time you get free from the work of learning documentary production. When you say that you are learning the production of documentary, I take it as a comprehensive work that is itself a time-taking thing and might not allow you to venture for more.
Read the related question which gives a similar solution:
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-a-certificate-course-in-radio-jockeying-for-better-career-prospects-qna-4393561

Read voice training in place of radio jockeying:
Voice over/ training is a rising field and there are hundreds of radio stations of private media houses coming up in small cities all around India. Even abroad the scope is on the rise. I relate my answer more to the Indian landscape, as the query is about parallel studies with certificate course, consider the following:
1. If the certificate course is done after doing graduation then a Post-Graduation in Mass Communication/Mass Media/Media Production can also be done. I shall not hesitate to suggest even a Master's degree in a language - English, Hindi or the one you see as your preferred medium of a radio career.
2. If one does this after 12th, pursue graduation as a must to do thing. Any stream you may choose keeping in mind that an alternative career has to be met openly. RJ career can also be a part-time thing so you have enough time to do another degree or higher studies.
3. If this certificate course is done by someone who is a Master's degree holder, if not in language or social science, humanities, do one degree.
4. IGNOU offers a course in audio production as well and sees such more media related courses.

An advanced certificate/course can be taken as a specialisation in advertising management. Please refer to the answers that convey and guide in detail about this:
M.Sc in advertising management means it is a Post-Graduation and that too in one of the most complex areas of mass media and marketing in the present age. This is also stated that advertising as a specialisation remains one of the strong areas of learning.
Parallel courses must be done with care and proper selection.
Along with the Master's degree, some MOOCs - Massive Open Online Courses –
1 A Certificate in a popular language/foreign language that shall be used in your works and place.
2 Content writing and proof reading.
3. Web development and digital marketing.
4. Music and sound mixing basics/audio production.
5. Web-based writing, social media, etc.

There are many similar questions that can help you in understanding the parallel course requirements.
Parallel courses must be done with care and proper selection.
Along with the Master's degree, some MOOCs- Massive Open Online Courses.
Refer the following answers:
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-a-certificate-in-editing-and-proof-reading-course-for-better-career-prospects-qna-4392895
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-a-m-sc-in-advertising-management-and-public-relations-for-better-career-qna-4392908
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-a-certificate-in-direction-for-better-career-prospects-qna-4392881
https://ask.shiksha.com/what-parallel-courses-can-i-pursue-with-a-certificate-in-documentary-production-for-better-career-prospects-qna-4392890