How do I update from snow leopard?

Having problems with Safari and Chrome picking up malware and adware.

How do I update a MacBook Pro from Snow Leopard in 2017? A lot of the messages are old. How do I figure out how far to push the MacBookPro7,1 with Intel Core 2 Duo Processors and 2.4 GHz speed and 8 Gigs of Ram? Should I leave it at 10.6.8 or can I push it to Yosemite or Sierra? Should I go in steps or jump to Yosemite?

We primarily use this computer for internet, Photos, Music and videos.

I think we can get Microsoft Office and Apple products to work on Yosemite.

If this one goes well, I will consider upgrading some of the other computers.

Thanks,