What happens if I send a bitcoin transaction with a low miner fee?

If you send a bitcoin transaction with a fee that is too low, the transaction may take days or weeks to confirm. Sometimes it will not confirm at all, and if this happens, it will make the funds spendable again from the original wallet. 

A sufficient miner fee makes it more likely that your transaction will confirm in a reasonably short period of time. A great resource to check the current miner fees is Mempool.space. There you will find the current fee average by checking the statistics of the latest block.

You can also check out txfees.watch to get an alert when fees are high to make sure you don't accidentally end up with a stuck transaction or pay fees higher than you expected.