For a 2 tailed test, the alpha is divided by 2. As we look back to the statistical table, we take 0.05, right? Alternatively, can we take 0.025 instead but do not divide the alpha by 2? Will that be the same?

What is the use of a 2-tailed test? If T > critical value in a 2-tailed test, what is the next step we should do? I don't really see much use of the negative tail side.