Question to all the Crypto Experts: What's the best way to convert Dollars into Cryptos

I got a little extra cash in my bank account this month and I want to invest it into some cryptos. This is the first time I will be investing actually dollars into cryptos so I want to know what the best way is.

Is Coinbase still the best option at converting dollars to cryptos? Isn't there a week or two of backlog before your account get approved?

I'd like to get this done the fastest and safest way possible so if anyone knows the best way at doing this please share with me in the comments.

Thanks,
@wakeupnd