Twig name for field of view
You could use: 

views-view-fields--[view-name]--[machine-name].html.twig

Use the machine name if you only want to affect a specific view Display. (IE: when you click + Add button, that other view/display does not get affected). If you wan't all displays to be affected, then don't include the machine name.

views-view-fields--[view-name].html.twig

{% if fields.field_photo.content|striptags == 'some value' %}
    ...
{% elseif fields.field_something_else.content|striptags == 'some value' %}
&lt;div class="something-specific"&gt;
        {{ fields.field_something_else.content }}
&lt;/div&gt;&lt;!-- .something-specific --&gt;
{% endif %}


If you just want to add a div class regardless of the value of the field and not depending on some condition, then simply 

&lt;div class="something"&gt;{{ fields.field_machine_name.content }}&lt;/div&gt;

OR you can do this through the Views UI:



Now, if you need something more global, IE: You want to affect all Views that contain your field and future views that will contain your field, then you need to use:

views-view-field--[field-name].html.twig

&lt;div class="something"&gt;{{ output -}}&lt;/div&gt;