Best way to grow and earn bitcoins is to invest in ptc sites and revenue share sites because of good roi and because you can earn bigger roi with ptc sites and revenue share then wuth trading.Also with ptc sites anf with revenue share it is possible to earn big money without any investments.
No one should invest their money in those PTC and revenue share sites because many of them are just scam and they would just run away after collecting a good amount of bitcoin by investors, and even if one is not a scam then you wont earn enough profit from it on daliy basis and that would make you wait a long time to reach ROI.
there are lots of other revenue sharing sites also. but they are free of cost. these revenue sharing sites don't require you to invest anything. but they need you to do some work.
for example if you are a writer, you can write articles and the platform take 10% to 30% and pay you 90% from 70% of your work earning.
like hubpages.com. youtube.com, dailymotion.com
hubpages.com is a site which offer you writing work and generate money from ads with your written articles. and give your share of profit.
youtube.com and dailymotion.com also types of revenue sharing sites. which generate revenue from ads with your created videos, and give you your appropriated shares.
(these are powered by Adsense.)