Football is one big learning curve and unfortunately for some of the bigger sides in the world, lessons that haven't been learnt as quickly as they could can cost jobs.
Whether it's a manger whose philosophy hasn't gone down well with his players, or a striker who just isn't doing his job and scoring bags of goals- there are always lessons to learn on the turf.
And this takes us to Manchester United- one of the biggest football merchandises in the world. Whilst they have the money, power and size- they're far from perfect, as we've seen over the past couple of years.
Meanwhile, their close neighbours Manchester City are setting the benchmark for some new practises in modern-day football that United really could look to in the wake of the upcoming season.
Sorry United fans, but' here are FIVE things you could learn from Manchester City...
Creating a modern-day brand
Whilst Manchester United have a long-lasting legacy primarily laid down during the Fergie years, everything about Manchester City's way of marketing themselves seems up-to-date and modern.
Love it or loathe it, City provide a proper matchday experience. There is always tons to do around the stadium before kick-off and everything about how they ensure you enjoy a matchday seems more intact with the modern-day world than United.
Building an academy
Since the club was taken over in September 2008, the extra income has really allowed City to expand their successful academy further afield.
The Platt Lane complex has undergone massive improvements and City's youngsters enjoy the very best facilities available to them in the country.
We saw just how many good academy players City have when Manuel Pellegrini elected to start a handful of them in an Cup game against Chelsea last season- showing just how important the academy is at the club.
The Women's team
A bit like the mens team, a lot of money has been invested into the Manchester City ladies team- to a level United just cannot match.
City boast a whole wealth of English talent in their books, with the likes of Karen Bardesly, Steph Houghton and Jill Scott all playing at City next season.
United in the meanwhile haven't done half as much to support and promote a ladies team in this manner.
Being brave with investment
Whilst we all moan about Manchester City's ability to dominate the market due to the funding they receive, we all secretly wish our own clubs had that sort of money sloshing around.
And credit Man City's owners- they've not been afraid to break the bank in order to bring home success- a little more so than the Glazers perhaps.
Not all signings have worked out, but when you're willing to continually reinvest, they don't all have to.
How to have non-meddling owners
Again, another example of how United's chiefs should be looking at the City hierarchy.
With expectations so high at the Etihad these days, any manager in the Manchester City hotseat is expected to bring home performances and most importantly, silverware.
Yet in the Blue side of the City, we rarely hear anything to suggest the owners meddle in the day-to-day running of the club, nor do they take money from the profits to line their own pockets- both things we've seen at United over the past two decades.
FC United of Manchester, a phoenix club born out of the frustrations of former United fans show just how disillusioned some are with the Old Trafford hierarchy.