OK. Say you want to do a complex and difficult task. Say build a house. That complex task can be broken down into smaller singular tasks with an easily defined starting point and ending point. Then you analyze each one for how long it takes, what resources it requires and how it relates to the other tasks. Some tasks can only happen after other tasks have been completed (cant paint a wall that hasnt been built yet). Some tasks cannot happen anymore after other tasks were completed. Some tasks must happen simultaneously, some tasks cannot happen simultaneously because for example they require the same resource which cannot do two things at once.
Project management is the art of keeping track of all of these relations at once, forming an ideal plan based on those relations to meet certain criteria (such as *minimize time, minimize cost, do not hire more than X people simultaneously etc.*) dictated by the context of your project and by whoever hired you to do it and then actually seeing it throug in real time and when needed adjusting the plan when circumstances change.
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