What is the ultimate tech stack of 2026??

Hello everyone , I am studying bachelors in computer science and information technology in Nepal. I am learning the technology's and I want to make a solid career in the tech field.

I want to know about the ultimate tech stack in 2026 and beyond, meaning which of the tech have highest demand and jobs right now. I am a tech enthusiast and first learner.

I want to start my career from some of development instead of going to cloud, DevOps, cyber security , artificial intelligence, machine learning and data science . I feel that these all are the subsets of software development/engineering. So I want to make my foundational base stronger.

If anyone can help me then I will be really grateful to him and really appreciate his time to reply !