What is the + and - of Linux2.6? What level of user can use it?

Question

linux

On the Internet, unfortunately, there is almost nothing. There is only an article about its installation and configuration, the article is called "nuclear physics for a housewife (stupid scrubber, damn it!)

Answer 1

What you need? Learn Linux? Install some Ubuntu and explore. There are online terminals on the Internet:
www.tutorialspoint.com/unix_terminal_online.php
cb.vu
Each successive version of the kernel supports new hardware, standards, network protocols, security, drivers, and optimizations. Nobody uses it directly. Only through the terminal or some software.

Answer 2

Linux 2.6 is old, though. Even taking into account the fact that 2.6.42 is the last kernel according to the old versioning scheme, there is still 4.4 now.
And you can't "use Linux", it's the kernel. No shell, no bootloader, nothing. On the basis of the kernel, GNU utilities, bootloader (now most often grub2), init-a (now most often systemd), x or world, a package manager and some DE / WM, they assemble a ready-made distribution kit, which end users use. For example, ubuntu is the same.
By the way, android is also a distribution based on the Linux kernel (but not a "based" GNU, so not GNU/Linux).