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.