If Singapore has the best air quality in 2015, and improves it even further in 2016, are they guaranteed to remain at #1? What if Denmark also improves its air quality, or New Zealand (which, say, had been left out of the rankings in 2015) joins the rating system? Maybe countries 2–10 all improved dramatically and Singapore has now fallen to #11, even though they technically got better, not worse. Because there are many other factors at play, Singapore's ranking could change in spite of any action (or inaction) whatsoever on their part.
Otro factor para tener en cuenta es el tiempo de carga, puesto que es importante para el SEO. Cuanto más rápido sea el sitio, más fácil será visitar e indexar una página. Las imágenes influyen en el tiempo que se carga un sitio web, especialmente cuando se carga una imagen grande y se muestra muy pequeña, como usar una imagen de 2500 × 1500 píxeles y mostrarla a un tamaño de 250 × 150 píxeles. Aquí lo ideal es escalar la imagen al tamaño que quieras mostrarla.

The Leiden Ranking enables you to select sophisticated bibliometric indicators, to generate results based on these indicators and to explore the results from three different perspectives. Best known is the traditional list view, in which you can rank universities according to a selected indicator. The Leiden Ranking offers two additional perspectives: the chart view and the map view. The chart view shows universities in a scatter plot, so that you can explore the performance of universities using two selected indicators. The map view shows universities in a world map and provides a geographical perspective on universities and their performance.
Para entender melhor, imagine uma biblioteca. Quando estamos buscando, por exemplo, por um livro sobre SEO, nós não precisamos ir de prateleira a prateleira para buscar por esse conteúdo — nós recebemos orientações sobre o local específico onde as informações sobre SEO se encontram, o que torna mais prático e fácil o acesso aos livros e às informações contidas nele.
Moz Pro’s powerful rank tracking software tool retrieves search engine rankings for pages and keywords, and stores them for easy comparison later. No need to manually check daily — Moz Pro subscribers can track selected rankings data over time to see which efforts are making the most impact as well as schedule automated reports to stay informed on changes.
Las acciones de SEO no son acciones pagas, pero esto no quiere decir que realizarlas sea gratis. Realizar SEO consume mucho tiempo y dedicación por lo que el costo está relacionado con el valor de las horas de trabajo y experiencia de la persona que lo realizará dentro de la empresa (In-House SEO), o el costo del servicio contratado fuera de la empresa (Outsourced SEO). Dependiendo de la industria y el tamaño de la empresa será más eficiente contar con un In-house SEO o tercerizar el servicio.
Domain Authority is based on data from our Link Explorer web index and uses dozens of factors in its calculations. The actual Domain Authority calculation itself uses a machine learning model to predictively find a "best fit" algorithm that most closely correlates our link data with rankings across thousands of actual search results that we use as standards to scale against.
Metadescripción: este es el texto que aparece en los resultados de búsqueda (SERP). La metadescripción no afecta a tu SEO directamente, pero sí que es una etiqueta importante porque influye en el número de visitas que recibes desde los motores de búsqueda. Cuando redactes la metadescripción de tus páginas, trata de incluir tus palabras clave y un call to action ("conócenos", "visítanos", "cotiza hoy", etc.). Recuerda que no debe excederse de 155 caracteres.
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