How to make old iMac faster | Make an iMac super fast with an SSD

See the entire process of a 27" Late 2017 iMac SSD upgrade in this video!
Here are the list of items to check out-
SSD- amzn.to/3AzFgu4
IPA solution-amzn.to/4dusA61
Screwdriver Set - amzn.to/3SZ0CqT
.
.
.
Here are the FAQs for you-
1. What is the Fusion Drive?
Apple's Fusion drive iMacs still have a regular HDD in them, but it's cached by a very small NVMe SSD mounted on the logic board.
2. Do I need an SSD if I have a Fusion Drive?
Yes. The fusion drive is better than HDD only, but it's still pretty bad. Hybrid drive setups like this are a stop-gap, and still nowhere near as fast as pure SSD. Also the HDD can still be failing, bringing down the entire system.
3. How do I deal with a Fusion Drive? Can I still use it afterwards?
My recommendation is to change the HDD to an SSD as per the video, and just erase the Fusion SSD in Disk Utility, leaving it unformatted and unused. It's too small to be useful. Technically, there are commands to rebuild a fusion drive to work with the SATA SSD, but this is generally a terrible idea that will just overcomplicate things for no benefit.