what is web crawler - rules of thumb?

what is web crawler - rules of thumb?

Also, consider technical factors. If a site has a slow connection, it might time-out for the crawler. Very complex pages, too, may time out before the crawler can harvest the text. If you have a hierarchy of directories at your site, put the most important information high, not deep. Some search engines will presume that the higher you placed the information, the more important it is. And crawlers may not venture deeper than three or four or five directory levels. Above all remember the obvious - full-text search engines such index text. You may well be tempted to use fancy and expensive design techniques that either block search engine crawlers or leave your pages with very little plain text that can be indexed. Don’t fall prey to that temptation.

rules of thumb:

The simple rule of thumb is that content counts, and that content near the top of a page counts for more than content at the end. In particular, the HTML title and the first couple lines of text are the most important part of your pages. If the words and phrases that match a query happen to appear in the HTML title or first couple lines of text of one of your pages, chances are very good that that page will appear high in the list of search results. 14 A crawler/spider search engine can base its ranking on both static factors (a computation of the value of page independent of any particular query) and query-dependent factors. Values
Long pages, which are rich in meaningful text (not randomly generated letters and words).
Pages that serve as good hubs, with lots of links to pages that that have related content (topic similarity, rather than random meaningless links, such as those generated by link exchange programs or intended to generate a false impression of "popularity").
The connectivity of pages, including not just how many links there are to a page but where the links come from: the number of distinct domains and the "quality" ranking of those particular sites. This is calculated for the site and also for individual pages. A site or a page is "good" if many pages at many different sites point to it, and especially if many "good" sites point to it.
The level of the directory in which the page is found. Higher is considered more important. If a page is buried too deep, the crawler simply won't go that far and will never find it. These static factors are recomputed about once a week, and new good pages slowly percolate upward in the rankings. Note that there are advantages to having a simple address and sticking to it, so others 15 can build links to it, and so you know that it's in the index

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