New to programming,
Tried to configure kdevelop and then tried to build and execute a piece of code and ran into this error:

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/home/x/projects/First/build> make -j2
[ 50%] Building CXX object CMakeFiles/first.dir/main.cpp.o
In file included from /usr/include/x86_64-linux-gnu/c++/8/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/c++config.h:508,
                 from /usr/include/c++/8/iostream:38,
                 from /home/x/projects/First/main.cpp:1:
/usr/include/features.h:424:12: fatal error: sys/cdefs.h: No such file or directory
 #  include <sys/cdefs.h>
            ^~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/first.dir/build.make:63: CMakeFiles/first.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/first.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
*** Failure: Exit code 2 ***

What should I do?

well, the text says it all, you are trying to use a library that is not in the location you look for it, so either you don't have the library or your path is wrong:

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/usr/include/features.h:424:12: fatal error: sys/cdefs.h: No such file or directory

read the outputs, those are usually explaining what is wrong