hiding script contain keyword

hello guys... i need some advice here...
is it possible to hide any keyword spamming or branded keyword from view-source and even rich result but still google read it???
i saw a few people doing it like inpuuting any branded keyword few competitor and hide it but their domain appear on the competitor page when searching their branded related keyword..
when checked the domain didnt get any rank in the big keyword just all branded and variaton of another competitor... even their brand name are wayyy too different each other

this can be done with server-side and client-side javascript hiding/showing tricks for googlebot. So for googlebot some script will load in DOM with competitors keywords using server-site or client-site features. If seen from browser or even fake googlbot crawling it, nothing will be loaded, but if real bot crawls, it will get loaded, and indexed.

can you give me some example for it and how to do it???

You're asking for a "how-to" on a technique called cloaking, and you need to be very careful here.

The first reply is correct—that's how it's done. You check the visitor's user-agent or IP on the server, and if it's "Googlebot," you show them the spammy keyword page. If it's a real person, you show them the normal page. But, to be blunt, this is one of the oldest and most-penalized black-hat tricks in the book. It's not a clever loophole; it's a direct violation of Google's guidelines, and they've been hunting for it for over a decade.

It's the fastest way to get a manual penalty and have your entire site de-indexed. Don't do it on any site you care about.