Blogger Seo

I prefer to use minima clean template. I did lots of research about blogger seo...
I m talking about coding not keywords.

1) title tags

<b:if cond='data:blog.pageType == &quot;item&quot;'>
<title><data:blog.pageName/> | <data:blog.title/></title>
<b:else/>
<title><data:blog.pageTitle/></title>
</b:if>

Code (markup):

2) Meta tag for home page only

<b:if cond='data:blog.url == data:blog.homepageUrl'>
<meta name="description" content="this is the blog description" />
<meta name="keywords" content="keyword1, keyword2, keyword3" />
</b:if>

Code (markup):

3) Dynamic meta tag (Blog Title into meta tag keyword and meta tag description)

<meta expr:content='data:blog.pageTitle + " - your blog description here"' name='description'/> 
<meta expr:content='data:blog.pageTitle + ", your keywords here"' name='keywords'/>

Code (markup):

4) change H1 for post title ( minima default comes with H3 tag)

<b:if cond='data:post.title'>
<h1 class='post-title entry-title'>
<b:if cond='data:post.link'>
<a expr:href='data:post.link'><data:post.title/></a>
<b:else/>
<b:if cond='data:post.url'>
<a expr:href='data:post.url'><data:post.title/></a>
<b:else/>
<data:post.title/>
</b:if>
</b:if>
</h1>
</b:if>

Code (markup):

and add this

h1.post-title, .post h1 #Blog1 h1, #Blog2 h1 { font-size:1.5em; }

Code (markup):

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My point is no 1 and 2 is ok no problem. ( no duplicate content errors)
but I m very confused with h1 and meta dynamic meta tags...

I have seen many of bloggers dont use default blogger header widget ( title and discription)

Problems------->>>>

1) If I remove header widget ( title and discription) will it affect to the seo?

2) How can use both of meta tags (no 2 and 3 )?

3) If I rename all h3 tag to h1 for better post title index, is it ok?

.post h3 ----->>> .post h1 ( all of like this )

.post h3 a, .post h3 a:visited, .post h3 strong

.post h3 strong, .post h3 a:hover

<h3 class='post-title entry-title'

</h3>
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digitalpoint experts please help me.. Appreciate any kind of help???

 

nobody?????