`esc_html` would be used inside of html for example between a `<p>` tag

    <p><?php echo esc_html( $some_variable ); ?></p>

`esc_attr` would be used for escaping attribute values on html tags like so:

    <p my-attribute="<?php echo esc_attr( $some_variable ); ?>"></p>

applying `_e` to the end will automatically echo it for you e.g:

    <p><?php esc_html_e( $some_variable ); ?></p>

    <p my-attribute="<?php esc_attr_e( $some_variable ); ?>"></p>