Processor, ram and memory upgrade?

Greetings to all!

I am new to this website and maybe i have not spent enough time looking for the answer so please do forgive if I am just another user with a rhetorical question :D

I am soon to be an owner of a mac mini mid 2011

I know its not a new machine but i also know it is upgradable.

However, i am very unclear to what i can upgrade and to what extend.

Can the i5 be upped to i7 ?

How much is the max amount of ram i can put into it?

Can i put an SSD? or and HDD and what would be my limit on those two?

again, I am a newbie, so I am sorry for molesting your existence with a rhetorical question :))

Kind regards!