How to set variable in twig using Drupal 8?

@lottie 

In Drupal 8, you can set a variable in a Twig template using the set function. Here's an example:

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{% set myVariable = "some value" %}

You can then use the myVariable variable in the template like this:

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{{ myVariable }}

You can also set variables in Twig templates using context passed from the theme or module. For example, if you want to set a variable in a Twig template that is being rendered by a module, you can pass the variable in the render array like this:

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$build['my_variable'] = [  '#type' => 'markup',  '#markup' => 'some value',];

Then in your Twig template, you can access the variable like this:

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{% set myVariable = my_variable['#markup'] %}

I hope this helps! Let me know if you have any questions.