You are already having a job in Mechanical Engineering line. Now you have an inclination to switch to IT or computer line. This is alright but what is the main thing that is driving you to think so. Is it the earning potential of IT people or your interest in IT area. The answer of this question is required to know whether you are really interested in IT line or simply fascinated by it. Anyway, I assume that you have a liking for IT area and you are also stagnated in your present job and do not see much prospects of growth there. It will also matter at this stage that how much computer awareness you have as regards to knowledge of computer languages and other computer application being used in mechanical engineering work. For a mechanical engineering graduate there are scope in IT area in mechanical designing and concerns of mechanical parts used in robotics and automation industry. But that will again be confined to the mechanical stream. So, we have to think of some certificate course or diploma course after which you can enter the computer industry. So there are some options and these are as follows. These are not merely an option but good from job point of view also in today's market -
1. Data Science - It is one of the emerging area and requires mining of data, assembling it and presenting it in a business format where it is useful for decision making. It requires a good academic background and one will have to learn the computer language like Python or equivalent and should have the knowledge of basic computer skills like MS office and basic graphic skills. There are courses on Data Science available in internet and basic courses are free of charge also.
2. Networking and Security - This is slightly a specific area but very interesting and rewarding if one can get experience in it. One will have to go through a diploma or certificate course in this from a good computer institute and then can apply in the industry. Everyone today wants the safety of their computer system from cyber attacks.
3. Digital Marketing - This is also becoming a lucrative area and one does not require high computer skills for it but it is also a rewarding field. It is more related to marketing in the digital arena as everyone is having a handheld device with him where a company can always present its product to the user. One will have to do a course in digital marketing from some institute if one has a liking for this business marketing course.
4. Data Management - This also does not require high skills in computer sciences. For this, one will have to go through some course in Data Management and generally this course will enable one to manage the data, navigating the data, designing and planning of database, managing client accounts etc. There are softwares available in the organisations to cater to these and one has to use them as needed.
In addition to above, there are some courses which are general in nature and I have not recommended them above as you are not from the computer science background but yes, if you feel interested it is not a bad idea to go through them also at an opportune time to enhance skills in the IT area. These are web designing, 3D printing, animation, software testing, system management, networking, artificial intelligence, cloud computing etc.
Knowledge is power.