What are the main mistakes amateur soccer players make but professional players avoid?

Most of football fans play football themselves with their friends, which is definately a relaxing thing and could help us understand this kind of sport better. And we know the difference between amateur footballers and professional ones are huge. What are the main mistakes amateur soccer players make but professional players avoid?

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Experts of last DAILY TOPIC: If football knowledge will be tested in school, what question will you set? Now it's time to show off!

@The-LeoMessi-CULE123: I would like to conduct an oral exam where I will like to make children name Arsenal's defs.....like Stephen Lichsteiner?....Konstantinos Mavropanos?....and maybe....Sokratis Papastathopoulous?(If he is coming!!???)....pls check if my spellings r correct!!✌??

@tarekmad: Q1: who invented the football game?

Q2: what is the difference between Ligue and Cup?

Q3: why do all Clubs of one country participate in the qualifications of the Cup? 

Q4: what is the first criteria that is considered in the qualifications of two teams that have the same points in a tournament? 

@estera: First question , what is the difference between real bus and Mourinho's bus ?

Second question , what is the secret of Fellaini's hair ,what conditioner he uses ?

Third question, if Sergio Ramos wouldn't be football player , Which sport would he choose: a) Judo ; b) Karate ; c) Capoeira ?

Fourth question, what is the secret of Luis Suarez' bite ?

Fifth question, the most important one ,is Messi a human??? ?

@BöckieLRC2K18: Question #1

If x-Ronaldo & y-Messi

solve (z) for the future of football.