maybe a stupid question but i'm a beginner in the world of bitcoins.
after the split there will be a same amount btc as bcc on your wallet.
but my question is are the balances of btc and bcc always synced if you do transfers on btc network and transfers on bcc network?
No, you BCC balance is one-time deposit. Your BCC and BTC are not synced.
For example, if you have 1 BTC, you will have BCC too, but if you spend 0.1 BTC, you still have 0.9 BC and 1 BCC. The same thing happens will hapen if you spend 0.1 BCC, you will have 1 BTC and 0.9 BCC. Basically, they are on 2 different blockchains.