This question is being asked many times on this forum. You can check the answers and most of them will suggest you to save/hold/reinvest your bitcoins for longer times. Now as you stated that you kept 13 cents and it became 50 cents after 7 months or so. Well that change you may find very little but with bigger investments you get bigger returns. Also, you must invest with right time, such as bitcoin price at lower side, this means you will get more bitcoins in less amount spent. Also, when the price increases the same amount of bitcoin will have more dollar value. Thats very easy calculation but basis of how you invest. Household really hold it.
This is mostly seen in this section and i know many people answered it but i will answer it for the sake of the mankind. The 1/3 of my bitcoin is i will spend it and use it for many purposes like travels,buy some goods and many more and the rest i will keep it or save it in my wallet so that if something happen, i have left for it.
Well I would like to share my opinion as I think it is good to mix both the spending for the need and to save it for the future. Bitcoin is the best saving because it has the potential to increase the value. It is all need to have the patience because the price can go down sometimes so! The right and straight way is to go through it is to hold your bitcoin even if you see the price of the bitcoin is decreasing because after a little dump the price of the bitcoin will take a high pump. You can spend some bitcoin only in the case of some emergency.