How to create a programming language in C or C++ or Python [read the body before you downvote]

Have a look at those 2 links:
Compilers: Principles, Techniques, and Tools - Wikipedia[^]
Apache Ant - Welcome[^]
ANTLR - Wikipedia[^]

As OG said: it is not for beginner.

Wirth's book, Compiler Construction[^] (1996), is still a very good introduction.

I think you are being optimistic. I actually did this once. I wrote my own language, debugger, and then changed everything from byte code interpretation to native machine code execution. That was my full time job and it took me about two years to do all of that. You probably don't need your own debugger but for various reasons I did. Still, that leaves an awful lot of work to do. First you need to define and specify your language. Then you need to make a parser to process the source code. Another major component will be to decide how you want your programs to execute. Do you want an interpreted virtual machine like Java uses or do you want machine code to execute like C compilers use or do you want something in between those, sort of like how the .net languages work?

I think you could find yourself spending six to eight months on just the language design and specification and parser. Then you will figure out how much you learned during that process and decide you could have done it all much better and want to do it all over again. That happened to me and I decided the front end was good enough, despite it flaws, and so I decided to rewrite the back end, the code generation part. That ended up paying off in a big way for me because the execute speed improved dramatically. The thing is, with machines as a fast as they are today, that is probably a very low priority. If performance is that critical there is no good reason what so ever to write your own language. Therefore, decide what your priorities are with this project and focus on that aspect. If I were to do it all over, my priority would be to design the best front end possible. The rest of it will be fairly easy as long as you have a good language design and parser for it.

Consider learning some languages like C or Java at first. Than you also need some abstract knowledge in computer science.
To be honest: you better invest your efforts in learning C. Read my How to Start the Homework or a Developer Career? to learn from my 20+ years experience in the software development.

Six to eight months isn't enough time to produce something useful, not when you're starting by asking for background reading material. I've probably spent 2 man-years (4,000 hours) on a C++ static analysis tool[^]. It does many of the things that a compiler does but only produces object code for a simple, virtual stack machine (so that I can check if it properly interpreted the code). It also assumes that the code already compiles, so it omits checks that a true compiler would have to include. But if the time spent on the static analysis portion had instead been spent on generating object code and adding more checks, it could be generating object code by now, but nothing as efficient as that produced by good C++ compilers.

IMO the best start in the right direction would be this book flex & bison: Levine, John: Kindle Store[^]

By the end of the book you will have fully functional SQL parser (it covers some complex logical calculators too). With few tweaks you can adopt it to your own programming language. It uses Flex/Bison lexer and parser generator (both free GNU license) and utilizes BNF (Backus–Naur form) for grammar rules file.