Your seed phrase is what that you can use to access your bitcoin on your wallet and to spend the coin. Many people are sending email that they should enter their seed phrase on a site. If they enter the seed phrase their, the bitcoin will be sent to another bitcoin address by the scammer.
Do not backup your seed phrase online because scammers can get to it online.
That is a fact. a seed phrase is one of the major things we should learn about wallets. How to make sure the wallet is secure before having our funds in the wallet is very important because if we mistakenly expose our seed phrase, that's the biggest mistake which will lead to our funds being lost. Using different methods to keep your seed phrase secure is very important. I also know someone who used two methods to store his seed phrase, he memorised it in his head without missing a word and also wrote it down in different places to make sure his seed phrase is secure. He even values the seed phrase more than the money because losing your seed phrase means losing your funds completely. If I'm not mistaken, knowing how to keep your seed phrase secure is the first thing we should learn about cryptocurrencies.