Login search engine questions and Answers-search engine technology

Question 1: When a site has been logged into the major search engines, and the location is good, after a period of time need to re-register it? If yes, how long should it be better?
In general, we do not need to re-register, unless the site's ranking in the engine dropped or your site has a relatively large update. For some minor updates, you do not have to re-register because most of the engines that use the search robot (Robot) will have to visit your site every China. For the decline in the rankings, you need to first analyze what is the reason.
In normal circumstances, the rankings will gradually decline as new sites are constantly logged in. In this case, you should pay attention to monitoring, when the ranking exceeds a certain value, you can consider re-register. But if this happens: the site's ranking suddenly drops from 3 to 279, it will be useless to simply log back in, because this is often the result of a change in the engine's query algorithm. You need to first study the engine's new query algorithm, adjust the site's page, and then re-register.
In general, do not register regularly unless something is wrong ——— because too many search engines will punish those who register frequently.
Question 2: I heard that many search engines do not accept the free site, and need to have a separate domain name, is this true? First, not all search engines reject free sites, but they do. Most engines record the IP address of each login site, and often many free sites share an IP address, so that when the site is registered with the same IP address, the search engine thinks it is a frequent registrant, and the address is sealed off.
Secondly, many of the engines, such as Yahoo, which are artificially classified, are now basically no longer included in the free site, because the workload of these engines is very large, but also because many free sites often appear updates slow, stop updating, unstable or suddenly disappear and so on.
　

Therefore, if you really want to develop on the Internet, you should have their own independent domain name and space, and two years 700 yuan of international domain name fee and 500 yuan per year 30M space fee than traditional investment is insignificant.
Question 3: For each domain name, how many times can be submitted, but not by the search engine that is frequent registration?
Each search engine has a special page about how to submit URLs and related regulations, as long as you look carefully, you can find each engine to submit the number of restrictions. But according to my experience, they often say something different from what they actually do. For example: AltaVista stipulates that each domain name can submit up to 10 pages per day, but in fact, more than 2 times the registration will not work.
For the general engine, there is a more common way: Every day domain name up to register once, and then approximately every 30 days to submit again, pay attention to the content to be updated! Also remember, every page of the site should be able to link from the homepage, and then submit the first page.