This seems easy, but not all online reviews are created equal. Over the last few years, it is found that Google reviews are fairly accurate, with lots of locals usually contributing, and there's the added convenience of having automatic translations in other languages translated into yours.
If you search online for "best restaurants in Austin" you can also filter by rating and only see results rated 4.0+ or 4.5+ out of 5 stars. This is one of the best ways to find best things you can do in Austin and good restaurants to visit while visiting a new place. Instead of sticking to a list of general restaurant recommendations.
Ask locals or frequent visitors, even if you think you have nothing to do with the place you're visiting, you'll be surprised.
Book some restaurants in advance, if there's a place you really want to visit, it might be a good idea to order your food in advance.
Some countries rely more on reservations than others and are also useful for popular upscale dining that you might consider something from a list of the world's 50 best restaurants or the world's most popular restaurants Big cities.
Be flexible with booking times and consider lunch as an option to increase your chances of making hard-to-reach reservations.