You need to have knowledge of linear algebra and calculus. A Software engineer should have knowledge of C, C++, or Java programming languages, software development, Data structures, DBMS, Computer Networks. There are a lot of courses available online you can take one subject at a time and complete them.
Create a good profile on GitHub with projects and publish good work. Apply for internships or entry-level jobs in companies.
You can watch this video to know more about the work of a software engineer:
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