1.I personally use windows because i have more knowled with it and some functions/extensions work only with windows, anyway, normaly linux is better than windows exept u know how to config windows rightly.
2.64 bit (when ur system supports this)
3.There are lots of possabilitis, dependent on what u want to do/host, also its important what hardware u have, as example: an old

laptop - replace the old heat paste and clean it
For question 3 some more informations are needed
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