The H1 tag of your page seems not optimized.

[chamo4u]

checking my site prestahop 1.7.5.0 i see this    

The H1 tag of your page seems not optimized.

<h1><img src.. ></h1>

The <h1> tag seems too short, it should be about 70 characters.

Inside your tag <h1> there is only an image, remember to not use a logo or an image inside your <h1> tag.

Header.tpl   have this code  

 

{**
 * 2007-2018 PrestaShop
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/AFL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [email protected] so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to http://www.prestashop.com for more information.
 *
 * @author    PrestaShop SA <[email protected]>
 * @copyright 2007-2018 PrestaShop SA
 * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
 * International Registered Trademark & Property of PrestaShop SA
 *}
{block name='header_banner'}
  <div class="header-banner">
    {hook h='displayBanner'}
  </div>
{/block}

{block name='header_nav'}
  <nav class="header-nav">
    <div class="container">
      <div class="row">
        <div class="hidden-sm-down">
          <div class="col-md-5 col-xs-12">
            {hook h='displayNav1'}
          </div>
          <div class="col-md-7 right-nav">
              {hook h='displayNav2'}
          </div>
        </div>
        <div class="hidden-md-up text-sm-center mobile">
          <div class="float-xs-left" id="menu-icon">
            <i class="material-icons d-inline">&#xE5D2;</i>
          </div>
          <div class="float-xs-right" id="_mobile_cart"></div>
          <div class="float-xs-right" id="_mobile_user_info"></div>
          <div class="top-logo" id="_mobile_logo"></div>
          <div class="clearfix"></div>
        </div>
      </div>
    </div>
  </nav>
{/block}

{block name='header_top'}
  <div class="header-top">
    <div class="container">
       <div class="row">
        <div class="col-md-2 hidden-sm-down" id="_desktop_logo">
            {if $page.page_name == 'index'}
              <h1>
                <a href="{$urls.base_url}">
                  <img class="logo img-responsive" src="{$shop.logo}" alt="{$shop.name}">
                </a>
              </h1>
            {else}
                <a href="{$urls.base_url}">
                  <img class="logo img-responsive" src="{$shop.logo}" alt="{$shop.name}">
                </a>
            {/if}
        </div>
        <div class="col-md-10 col-sm-12 position-static">
          {hook h='displayTop'}
          <div class="clearfix"></div>
        </div>
      </div>
      <div id="mobile_top_menu_wrapper" class="row hidden-md-up" style="display:none;">
        <div class="js-top-menu mobile" id="_mobile_top_menu"></div>
        <div class="js-top-menu-bottom">
          <div id="_mobile_currency_selector"></div>
          <div id="_mobile_language_selector"></div>
          <div id="_mobile_contact_link"></div>
        </div>
      </div>
    </div>
  </div>
  {hook h='displayNavFullWidth'}
{/block}

what do i have to change to fix this error  

Kind Regards  a newbie 

 

Edited June 8, 2020 by chamo4u
missing info (see edit history)

[Ress]

This is default from prestashop classic theme on the home page. Delete the h1 tag from there, and put another h1 text on the home page.

[Nickz]

Don't trust any tool which gives notes like too long, too short.

H1 to h6 are test formatting tags and should be used as such.