How To 301 Redirect WordPress Site Without Plugins

Thank you for the great tutorial. I have few questions that no one seems to ask and seem trivial at first sight:
I want to change just the URL of a page and leave the content the same.
1. Can I just change the URL address in Page settings of my CMS if the page has almost no visits so transfer of "linking power" from 1st URL to the 2nd is not important/needed?
Will this ruin the ranking of my domain or all pages from it somehow?
2. Can I just delete the old page and create a new page with the proper URL and the old content if the old page has almost no visits , so transfer of "linking power" from 1st URL to the 2nd is not important/needed?
3. When I do 301 redirect, the content stays the same in the new page but I like to trasfer the "linking power" of the old URL should I keep the old page on my server during the set-up of 301 and/or after that so the redirect will work at all times?
4. If I have to keep the old page on the server does this mean I can just copy and paste the old content in the new page as well?

Perfect. Fixed my problem. Thanks so much for sharing this solution

This did not work (and yes, I tried the plugins and no, they do not work either)

Hi. very nice and spot-on video. It is just was i was looking for. Though i have a question if you can answer. I have managed to fix the redirects from desktop and is working. But i've also noticed more (some the same) redirects for smartphone. Will the desktop redirects fixed work for smartphone too? Thanks
btw
I've watched more of your videos which have helped me manage and organize my site better.

dosent work for me !

Thanks for this! Just got finished a successful redirect.

hi, i have changed my pages' url with yoast seo. but i forget to save old urls. then my ranking is suddenly decreased. pls help to 301 redirect my old urls to new....

Very helpful video. Thank you so much.

Hi there
Great video, can't believe it doesn't have that many likes.
Out of curiosity will 301 redirects affect seo? I've purchased a .melbourne geotld and was wondering what the impact will be on my current site?
Thanks Paul