{% if condition %}
    <!-- code block to be executed if condition is true -->
{% elif condition %}
    <!-- code block to be executed if the previous condition is false and this condition is true -->
{% else %}
    <!-- code block to be executed if all previous conditions are false -->
{% endif %}

{% if variable %}
    <!-- code block to be executed if variable is not empty -->
{% else %}
    <!-- code block to be executed if variable is empty -->
{% endif %}

{% if variable == value %}
    <!-- code block to be executed if variable is equal to value -->
{% endif %}

{% if variable1 and variable2 %}
    <!-- code block to be executed if variable1 and variable2 are both true -->
{% elif variable1 or variable2 %}
    <!-- code block to be executed if either variable1 or variable2 is true -->
{% endif %}

{% if variable in list %}
    <!-- code block to be executed if variable is in the list -->
{% endif %}