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Your withdrawal or trade limit will be according to the tier = your KYC rank.
Unlike other exchanges such as Kraken, Coinbase uses standardized withdrawal limits:
Withdrawals of both cryptocurrency and fiat currency are limited. Coinbase Exchange account holders have a default withdrawal limit of $100,000 per day. This amount applies across all currencies.
SourceHowever, you can request an increase of the limit and usually have to submit additional documents, e.g. proof of income.
By the way, Coinbase also limits FIAT deposits to a certain amount per day. However, this limit does not apply to cryptos, BTC and co. can be deposited as often as desired and in any amount.