Hi,
In KiCad 8, I created my schematic and generated the netlist. When I imported the netlist into the PCB, I encountered an error stating that it couldn’t find three footprints. These footprints are for three integrated circuits that I downloaded from a website and added to my project. During the footprint assignment step, I could locate the footprints I added without any issue. However, I only faced this problem in the PCB layout phase?how can I resolve the problem? THANK YOU for your answer
First thing you should probably do is trow away the tutorials you are using and find a more recent one.
Creating the netlist, and importing it has been deprecated for many years. PCB Editor / Tools / Update PCB form Schematic [F8] was introduced in KiCad V5, released in 2018 https://www.kicad.org/blog/2018/07/KiCad-5-a-new-generation/ and a great many other changes and improvements have also made since that time.
If the footprints are assigned properly in the schematic, then a normal [F8] should get them all on the PCB. But there can be problems, such as misspelled names or libraries that are not available. During the PCB Editor / Tools / Update PCB form Schematic [F8] process, you get a lot of information about what processing is done, and what errors are encountered. From there you can work on a fix for your footprint problems.
Thank you, I fixed the problem. 
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