There are several reputable websites that provide rankings of universities worldwide. Here are some of the best websites for knowing university rankings:

1. QS World University Rankings (https://www.topuniversities.com/): QS World University Rankings is one of the most widely recognized and respected university ranking systems. It provides rankings based on various indicators such as academic reputation, employer reputation, faculty/student ratio, research impact, and internationalization.
2. Times Higher Education World University Rankings (https://www.timeshighereducation.com/world-university-rankings): Times Higher Education (THE) World University Rankings is another reputable ranking system. It evaluates universities based on criteria including teaching, research, citations, industry income, and international outlook.
3. Academic Ranking of World Universities (ARWU) – Shanghai Ranking (http://www.shanghairanking.com/): The ARWU, also known as the Shanghai Ranking, is one of the oldest and most influential global university ranking systems. It primarily focuses on research output and quality, with a particular emphasis on scientific research.
4. U.S. News & World Report Best Global Universities Rankings (https://www.usnews.com/education/best-global-universities): U.S. News & World Report provides rankings of global universities, including overall rankings and subject-specific rankings. It assesses universities based on factors such as academic research performance, reputation, and international collaboration.
5. Webometrics Ranking of World Universities (https://www.webometrics.info/en): Webometrics ranks universities based on their web presence and impact. It considers factors like web visibility, the size of the institution’s online presence, and the impact of its web publications.

It’s important to note that rankings may vary across different websites due to variations in methodologies and criteria used. Therefore, it’s a good practice to explore multiple ranking sources and consider different factors when evaluating universities. Additionally, it’s essential to look beyond rankings and consider other aspects such as academic programs, faculty, facilities, location, and personal preferences when selecting a university.