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This tutorial teaches you how to design a blogger template from scratch.
  1. Go to 'Theme' and 'Edit HTML' in Blogger.

  2. Now add the basic HTML code.
     <html>
     <head>
         <title>Title</title>
     </head>
     <body>
         <p>Hello World</p>
     </body>
 </html>

    By clicking Preview button, It will show an error message Could not load theme preview: There should be one and only one skin in the theme, and we found: 0 Add the below code in head to avoid this error. 
    <b:skin><![CDATA[
/****CSS CODE*****/
]]></b:skin>
    After adding the above code it will show the error message like We did not find any section in your theme. A theme must have at least one b:section tag. Add the below code in body to avoid this error
    <b:section id="1"></b:section>
    Now the whole code will look like
    <html>
        <head>
            <title>Title</title>
            <b:skin><![CDATA[
            /****CSS CODE*****/
            ]]></b:skin>
        </head>
        <body>
    <b:section id="1"></b:section>
            <p>Hello World</p>
        </body>
    </html>
    The output of this code will be like this
  3. Add the below code in body to display all blog posts.
    <b:section class='main' id='main' showaddelement='yes'>
    <b:widget id='Blog1' locked='false' title='Blog Posts' type='Blog' version='1'/>
    </b:section>
  4. Next, I am going to add a sidebar. First add the styles of main and sidebar in the CSS.
    #main-wrapper {
    float:left;
    width:70%;
    }
    #sidebar-wrapper {
    float:right;
    width:30%;
    }
    Then use these styles for main and sidebar. Complete code is shown below.
    <?xml version="1.0" encoding="UTF-8" ?>
    <html xmlns='http://www.w3.org/1999/xhtml' xmlns:b='http://www.google.com/2005/gml/b' xmlns:data='http://www.google.com/2005/gml/data' xmlns:expr='http://www.google.com/2005/gml/expr'>
        <head>
            <title>Title</title>
            <b:skin><![CDATA[
    /****CSS CODE*****/
    #main-wrapper {
    float:left;
    width:70%;
    }
    #sidebar-wrapper {
    float:right;
    width:30%;
    }
            ]]></b:skin>
        </head>
        <body>
    <div>
    <div id='main-wrapper'>
    <b:section class='main' id='main' showaddelement='yes'>
    <b:widget id='Blog1' locked='false' title='Blog Posts' type='Blog' version='1'></b:widget>
    </b:section>
    </div>
    <div id='sidebar-wrapper'>
    <b:section class='sidebar' id='sidebar' preferred='yes' showaddelement='yes'/>
    </div>
    </div>  
        </body>
    </html>