When joining a new network, you may have the issue of not having enough of the native token to pay for gas fees on your first transaction. Some blockchains use faucets to provide these. On Avalanche you obtain these funds by bridging over $75 worth of assets on bridge.avax.network (the official bridge). When you do this, you will be airdropped AVAX to help facilitate your first transaction.
If you are a developer and using the testnet, there is a faucet to use. Note that these funds have no actual value and only work for the Fuji Network or a Subnet.