Programming Languages

There are so many courses to learn online from YouTube to personal blogs and a lot of online websites are providing course material for free of cost. But if you want to learn about the basics of Python then you should download an app to tighten your basic grip. Here is the link:
https://play.google.com/store/apps/details?id=technark.pythonforbeginners.

Yes, you can apply for jobs after completing your course in C, C+ and Java programming languages if you're a good coder and have good coding skills. There are possibilities for you to get a decent job with big companies.

C is not used to develop mobile application it is used to develop embedded software, networking and operating system related things. You can develop apps using C+, Python, Java, JavaScript, PHP, etc. Try to learn any of these languages to develop apps.

In my opinion, you should go for online courses on Coursera, Udemy, etc.

Data Science with python is a good option for any of the undergraduate/post graduate students because it is the current need of every industry.

Hi, Anu. Imarticus Learning offers short term courses in Python. This course also makes use of industry case studies, along with other great resources that are beneficial for you. Visit our page to know more: http://imarticus.org/certification-in-python. We would love to help you out!

Hi,
C, C+ and python are the most widely used languages for embedded systems. You can also learn rust and refer this link:
https://www.allaboutcircuits.com/news/programming-languages-for-embedded-systems-101-background-and-resources/

I mean certifications are useless if you do not know them. Even, without certifications if you can confidently tell the recruiter that you have knowledge in them and solve a few questions you will get a job.

It depends on company norms. Generally, companies demand no back-logs at the time of joining.
Good luck.