Belajar SEO to will try to give you some basic information about SEO which you have to know before you need to optimize your SEO web development. In general you have to understand 6 terminologies about SEO. The term as listed below.

1. Spider- Spider is actually some kind of a program that will download your web pages for indexing. This spider will act as a browser and the same thing what normal user is doing. The only different about Spider is that normal user will see the text, graphic and other information about the web pages where spider it self only looking at the source code or html code.

2. Crawler- Also a program but his job is basically try to identify and follow the available link each and every pages that you have. The crawler will act as what you are instructed him to do. For example if you want them to follow the link, you may use "dofollow" or otherwise.

3. Indexer- This is a program that will analyze the information that being gather by Spider and Crawler.

4. Database- I think this is very straightforward. Database in SEO will refer to the storage of information that being captured/downloaded/processed pages of your website/blog.

5. Results engine- This will be the final output that extracts information from the database

6. Web Server- It is a server that manage the interaction between users and search engine.

I hope with little info above will guide your SEO skill and as part of Belajar SEO is concern, all the SEO principles are more less the same between one search engine to another.