I'm going to start programming now. What should I start with? [Closed]

(Answer based on the assumption that you want to create an OS)

C is probably the only language that has long been used as a programming language to create an operating system (OS) and touch very basic parts of the network.
To be honest, it's hard to come up with a programming language for the first time, but I can't think of anything else.

For example, "Memorizing C Language" is a free Japanese language on the web for learning C language.
If you don't like this, other sites like Books sold at Bookstores, or

Once you are able to read and write C language to some extent, the next step is to do so.
I recommend as a Japanese book where you can learn the basics of OS creation.
As you build your operating system, you will learn what it takes to run many applications simultaneously on your computer, manage memory, and process TCP/IP and other networks.
If you don't like this book, there is Introduction to a 12-step Embedded OS (although it's an embedded OS, so it's a little different from the Windows and macOS I usually use).Also, the book you can find by searching Linux kernel is a little difficult, but it may be helpful.

Overall, I think it is full of difficult things, so I think there are many things that cannot be solved just by thinking for yourself.In that case, let's search by various words first.If it doesn't work, I think it's better to use a questioning site like Stack Overflow again or ask a familiar acquaintance.

[Free gift]

If you would like to learn more from this, it would be interesting to go to the OS-related courses sometimes held at national and local security camps hosted by the Information Processing Agency (IPA (Information Processing Agency)

• Security Camp Implementation Council
• Security Camp National Convention 2014 Create a Secure System Class
• Security Camp Kyushu in Fukuoka 2016 Let's play with each other and become hackers
• Create your own security camp 2017 language and operating system

Or it might be interesting to look at the source code of the actual operating system.For example, you can see the source code for the center of the OS (OS kernel) called Linux here.

• https://github.com/torvalds/linux

Starting with small educational operating systems such as xv6, and Minix, it may be interesting to play with kernel hacks.