Do you need to know more about how much is .3 bitcoin today?
The good news is that there are loads of conversion sites that can convert any amount of Bitcoin into just about any fiat currency, or other tokens as well.
One of the best parts about tokens is that they can be turned into fractional parts, and sent in whatever amount is needed. Bitcoin can do this, and most other tokens will do this as well.
If you want to convert your Bitcoin into USD, just click here to see the current rate for 0.3 Bitcoin in US dollars.
While you are there, you can see what that same amount of Bitcoin would be worth in other fiat currencies, or popular tokens too.
These free conversion tools can help you to learn about what Bitcoin is worth in other forms of money, but if you actually want to exchange the Bitcoin into another currency, you will have to use an exchange.
Withdrawals into fiat currency generally require some amount of KYC procedures, and may also require that you have a bank account.
Please be careful when choosing an exchange, and understand that fees will apply to any transactions you make.