4. Should alt coins be traded rather than HODL?
Yeah, I guess so that most of them should be traded.
I agree, because in my opinion some altcoin are better for trading (only certain altcoin are good to hold for the long term), because the risk of investing in altcoin is very big, so if you have made a profit from investing in altcoin, then I suggest you to selling immediately, because if you want to invest for the long term, then you better to hold Bitcoin.
Long term hold is also trading, the only difference is the time being.
I see some altcoins good for long term trade while the others are ok for scalping, especially those altcoins with a good hype and this is where day traders usually stay. Altcoins are good for long term hold as long as its a good project, start to analyze how its going and see if its the right time to buy or not yet, timing is very important as well.