Understand basics like the following:
1. Learn to back up your wallet balance
2. Learn to save your private keys and do not share them
3. Learn bitcoin balance typo errors can be made eg: 0.1 when you meant 0.01
4. Learn bitcoin is a non reversible payment
5. Learn to use reputable escrow with +1 or higher
6. Know in the bitcoin world of business anything can be gone within in instant.
Is backing your btc wallet really necessary?
If you lose your private keys, you lose your bitcoins. Backing up your wallet is not necessary, but why risk it? People lose their wallets all the time.