I believe the SIMPLEST way is Airdrop/Bounty Campaigns, where you can EARN it easily and without any financial requirement. However, IF you are not sure about that then you can do it via Crypto Lending, but then in this the investment factor comes.
If you can do that then like I said lending is logical way. If not then go for Airdrop Bounty, but of course, it is important to select trusted one instead of random.