veganbikes

Sort of wrong-ish only because they are posts from alibaba (and one is misspelled) or similar site for some of it. I wouldn't recommend buying a coil fork unless it is a high end one most of the cheap stuff just is a downgrade or if you already have one a grade from one same thing to the other. Get a quality air fork from a known quantity.

For a metal steerer tube a star nut setting tool is very helpful to have but "bike bicycle" is not needed Park Tool makes a fine star nut setter but Unior or Pedro's makes quality stuff. If you have carbon fiber you do not use a star nut setter but a compression plug. Typically your star fangled nut comes with the headset again if you are buying a headset of quality from a known quantity.

A crown race removal tool is also handy if you are moving from one fork to another but you can also get a new crown race from your headset manufacturer generally. Again though "bike bicycle" is not a thing. Park, Unior, Pedros...all make fine quality tools for the job.

A saw guide is nice however you can also use a pipe cutter as well. I do prefer hand sawing with a guide myself and that was an actual part from an actual tool maker so no worries there.

Posting a guide is helpful but just posting titles from Alibaba or Jeff Bezos is silly especially if you actually read them.

Basically most forks are all the same basic install. Things change minutely depending on steerer tube material but really it is all the same. Measure twice cut once if you are cutting and consider especially for carbon leaving a 5mm spacer on top but maybe just on anything or if you are unsure don't cut it till you are. If you are planning on selling the bike, go ahead and sell it now and get the bike you want. Don't just buy a bike to sell buy a bike that you will ride and enjoy for a while and if down the road you end up selling it the other owner can get a new fork or cut it down to their length as needed that is not your concern.