Need some advice for a newbie...

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For a basic number of components, yes. But if you would try to build a rig with 2 or more graphic cards for example, not every PSU will have enough cables to connect all of them. Same goes for some high end motherboard and EPS connectors - most PSU have only one such connector while some motherboards need two. But for a basic system, typical new PSU will have all connectors.
For a basic number of components, yes. But if you would try to build a rig with 2 or more graphic cards for example, not every PSU will have enough cables to connect all of them. Same goes for some high end motherboard and EPS connectors - most PSU have only one such connector while some motherboards need two. But for a basic system, typical new PSU will have all connectors.
 
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