Off topic:what is the best way to extract specific region of a RNA seq

Question

[Learner]

Hello,

I have RNA seq samples and I want to extract specific regions. I can work with linux, windows and any other platform

I open the data with any data reader and it looks like

chr1    10031   10107   2
chr1    11690   11720   1
chr1    11720   11752   2
chr1    11752   11763   3
chr1    11763   11766   4
chr1    11766   11796   3
chr1    11796   11828   2
chr1    11828   11839   1

I want to know what are these stand for and how can I get specific region from several files?

I searched a bit and I found people used to use IGV software which does not exist anymore. I appreciate any help