Power cable from wall socket to power strip

Since I started this thread I've been searching the internet for information about power conditioners and power cords. I found so many different and contradictory answers and opinions so I wrote these questions that made some here mad at me.
I'm sorry for that. It was not my intention to waste anyone's time and I'm certainly not trolling. Some answers got a bit too technical for me and I tried to rephrase my questions.
But I understand this is not something that has a solution that fits everyone.
mihorns answers made it clear to me that testing is the only way to find out what works best for one and each. As some of you already had said.
And again, I'm really sorry that I upset some of you.

Thank you all!

Trial and error seems to the way I usually evaluate changes I make within my systems, along with a lengthy audition.

@simna-

     I found so many different and contradictory answers and opinions so I wrote these questions that made some here mad at me.
                                        I’m sorry for that.

                                         You opened the thread with:

               I don’t want a discussion with ”non believers”.

                              Let the Cargo Cult go build another runway!

                                                    Who cares?

                                                 Happy listening!

simna OP

mihorn answers made it clear to me that testing is the only way to find out what works best for one and each.

How do we know which one works better? It is simple. The better one (power cord, any audio cable,  and any component) sounds closer to the original music. The original music is cleanest, smoothest, and the most musical. Alex/Wavetouch