magento2 add static block in phtml code example

Example 1: magento2 add static block in phtml

<?= $block->getChildHtml('my-main-phtml-block-cms') ?>

Example 2: magento2 add static block in phtml

<referenceBlock name="my-main-phtml-block">    <block class="Magento\Cms\Block\Block" name="my-main-phtml-block-cms">        <arguments>            <argument name="block_id" xsi:type="string">my_cmsblock_identifier</argument>        </arguments>    </block></referenceBlock>