I need some advices and explanation

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Thank you for the replies and advices. Niko, I didn't knew that, seems that's what I was missing here. Exhausting all the vids
Training only the 2nd 11 players is good and not so good in the same time, because you get the maximum bonus ( 10 % ), and rested main 11, but that means your main is not training that often. I had 2 matches per day, and gave up, because of lacking greens. The idea about staying at 8 % and have rested main 11 is better according to me. It's how I'm doing these days ( maybe even weeks, not sure ).
Would like to ask one more thing : What are your personal thoughts about friendlies ?
I mean, when do you think is best to schedule such, and why.
Do you think it's a bad idea arranging friendlies during the season, when you've noticed the friends' program in the rest matches, and yours.
Thank you in advance to all of you, who are helping me learn from my own mistakes.