One of the ways to build a portfolio for free is to do some research and find out what companies are offering promotions. There is an abundance of free giveaways, gifts and airdrops happening all the time in crypto!
One of the current promotions running is a ZenCash faucet.
Its simple to claim free ZenCash, all be it its not that much, but come on it's free!
So all you need is a ZenCash wallet and there are many options.