Coming back after a year away questions

So I have a few odd questions I can’t find the answer to since coming back to playing eso again so I feel you all can answer these. Is a Bow now better for a back bar weapon for my PVE dps stamina based characters? I always used to rock dual and 2h on my back bar for the shield and aoe hits but I see all the builds online are dual and bow now any reason why specifically? Also for vet maelstrom would a 2h be safer than a bow as a good shielding swing can save you more? Also I see the word Proc everywhere on all the guides but I’ve never understood what it meant I’ve played this game for years never getting into trials just play it for dungeons and cyrodil but I’ve never learned what proc is or how to achieve it? Thanks in advance!