finally i knew the differences between Templates and Layouts in Blogger.
and knew their advantages and disadvantages.
(copied this from somewhere)




ADVANTAGES OF LAYOUTS :

1. No need for republishing. Everything published immediately.

2. Labels can be used to categorize your posts according to keywords.

3. Increased traffic due to use of Labels.

4. One click access to editing widgets.

5. WYSIWYG (GUI) layout interface to arrange/edit your widgets on the PAGE ELEMENTS subtab of Template tab.

6. One click access to Layout/Page element tab from Dashboard.

7. Navigation Links at the bottom of each post.

8. Subscribe to Posts Atom (feeds) link at the bottom.

9. Way of the future as the Web gravitates to XHTML/XML and widgets.



DISADVANTAGES OF LAYOUTS :

1. Learning Curve to master XHTML/XML.

2. XHTML/XML more strict and spews out more errors than HTML.

3. Data separate from template code.

4. Widgets data not transferred along with widgets code when loading a new layout. After loading a new layout you have to enter widgets content separately.

5. At present not many XHTML/XML layouts are available free but many developers are coming out with new designs. Till then hack into your own layout to customize it.

6. No Previous Posts section. All posts in the Archives widget. Previous Posts section in sidebar can be added as a hack.

7. Many Javascript codes do not work here unless they are XHTML valid.

8. The expanded widget templates code is voluminous and difficult to navigate. This makes it more difficult to add a hack.

9. Difficult to add Adsense code within a post.

10. Many do not like/understand the Subscribe to Posts Atom link at the bottom.

11. Customizing each widget is more difficult. Though there is a Fonts and Colors tab it does not allow you to change colors of everything.

Only those variables described in the 'Variable Declarations' section at the top of the template can be changed. You can manually add more customization but that requires more knowledge of CSS and variables.

12. Cannot be edited in WYSIWYG web editors as it is in XHTML/XML.

13. Cannot be used on ftp blogs as they need to be hosted on Blogger servers.





ADVANTAGES OF HTML TEMPLATES :

1. Easier to learn.

2. Easier to change with less errors.

3. Data and template code loads in combination on loading a new template.

4. No need to backup widgets data separately.

5. Many ready made templates available on the Internet.

6. Previous Posts section present in the sidebar.

7. Javascript codes for adding the blings to your blog still work.

8. Adding a template hack is simpler.

9. Easier to add Adsense code within a post.

10. Customizing colors more simpler.

11. Can be edited in WYSIWYG web editors even by those having rudimentary HTML knowhow.




DISADVANTAGES OF HTML TEMPLATES :

1. Label links need to be added manually to sidebar like other links.

2. Labels below posts are present but cannot be customized.

3. Likely to be phased out in the future but not very soon.

4. Navigation links to Previous Post, Next post and Home have to be added via a hack.

5. Feed links have to be configured manually.

6. Cannot be ported to a Layout without a big headache. You have to load a similar looking layout and then hack it to resemble your old template.

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