How do I know which Drivers to Update - General question

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I'd like to suggest you click on the link below to get a fundamental sense of what each driver does for your computer.

www.dell.com/.../EN

" Another question is that when I just use the Dell apps on win 10 to see the status of my PC it sais that all important drivers are up to date "

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I'm assuming you're using Dell Support Assist to check for important drivers updates? If yes, Dell Support Assist is very reliable and accurate for detecting important drivers on the system.  

https://youtu.be/3k7CRFnBVAo

" For example, when i install one of these and return to the Driver download page, the latest driver is still indicated as a download option "

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It might take a few days to be updated on your Dell Product Support page. 

Drivers and Downloads FAQs

www.dell.com/.../SLN128938

Thank for the replies. Yes I am using Dell Support Assist which stated that I was up to date. However, the Bios on the Support page was a later one (which I updated). I would have thought that the BIOS update would have been an important one that I would have at least got a notification of? Thanks

Or.....

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click on windows icon at left bottom of taskbar, click Settings, System, and then 'Notifications & actions', see image below:

I suggest you click on the Support Assist settings icon and then click 'Notification', see image below.  

Thanks again guys. I had those settings above in place (they were already the default). However they did not recognise the new bios update. This makes me wonder how effective the notifications are. Have you cross checked all the important drivers available to see if they align with what is installed?