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Googlebot crawler follows the redirect, and the indexing pipeline uses the redirect as a STRONG SIGNAL that the redirect target URL should be canonical.
Serving 301 indicates to both browsers and search engine bots that the page has moved permanently. Search engines interpret this to mean that not only has the page changed location but that the content (or an updated version of it) can be found at the new URL. The engines will pass some link juice/weighting/SEO value from the original page to the new URL.
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ALSO be aware that when moving a page from one URL to another, the search engines WILL TAKE TIME to discover the 301, recognize it, and credit the new page with the rankings and trust of its predecessor. This process can be LENGHIER if search engine spiders rarely visit the given webpage or if the new URL doesn't properly resolve (redirect chains)
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Non trailing slash vs trailing slash
https://www.hello.com/abc vs https://www.hello.com/abc/
can be seen as two different pages
Browsers will render pages with varying type cases
https://www.hello.com/abc vs https://www.hello.com/Abc vs https://www.hello.com/ABC → each page can be seen as a unique page
Make sure canonical tags reflect the desired version