If you use Wordpress, I would suggest the Google XML Sitemaps plugin.

If not, you can just use the following website to create a sitemap for you:
Create your Google Sitemap Online - XML Sitemaps Generator

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I have added it.

http://www.advertisehotspot.info/sitemap.xml

but it seems to have a error? or is it right?

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Google has a tool I think its called Sitemap Generator. Do a search for that it will output a sitemap.xml file, then submit that. Certain platforms and hosts do this automatically for you also BTW.

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Since everyone already answered your first two questions, I'll just focus on the third

Sitemaps DO still work. Search engines still crawl sites of course, and sitemaps make them easier to navigate. The result is faster, more thorough indexation of the pages on your site.

It takes about 2 secs to set one up if you have WP site, no reason not to have one really.

(Sitemap case study: Do Sitemaps Affect Crawlers? | SEOmoz)

Try with Sitemap Writer Pro! Easy and quick !

You can add all links of your website on one page and link it within footer of your website and can also submit it over Google for fast indexing benefits.

You can check the XML sitemaps tutorial list in this XML sitemaps guide. It explains how to create, upload, submit and ping your website XML sitemap.

Ok cool Thanks guys!!

If you are using wordpress, i recommend searching for "simple sitemap". It is not an xml sitemap and is quite easy to set up

I see. I am using a phpbb forum. Not wordpress.

thanks

How about for blogger sites? how can i make a site map?

use
Create your Google Sitemap Online - XML Sitemaps Generator or
XML Sitemap Generator, Editor + Keyword Analyzer - XML Sitemaps Online to generate your sitemap and edit it.

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You mean sitemap for robots or sitemap for visitors? Or both of them?

Hello,

Site Map simply helps the Google to crawl into your website more deeply instead of going for only upper layers.You can add site map by having a Google webmaster tool account which can help you to add site map to your website.

1- First you need to pick one of Free sitemap generators Online. I personally prefer to use XML-Sitemaps.com, but you may find others useful as well.
2- Next follow the instructions in one of the Free sitemap generatorsto generate a HTML sitemap for your blog/website.
3- Then log in to your blog/website’s dashboard and create a newpage for it.
4- Every time when you create a new post you’ll need to update your sitemap. I just simply add my new post to my existing sitemap.