How intraday is possible when market quotes are delayed?

#1
I am learning to trade. I just found out that the quotes (prices) that we see on the terminal (or sites like google finance) are delayed by a few minutes - sometimes upto 15mins. Is it the same on brokers' trading terminals that we are provided when we sign up with them?

I am wondering how intraday buying and selling is possible under such settings? By the time we spot a trend, it would already have changed at the exchange :)

What are good workarounds for this problem, if any?

Thanks in advance.