Difference between form_for , form_tag?

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You would use form_for for a specific model, 

<% form_for @person do |f| %> # you can use f here

    First name: <%= f.text_field :first_name %>
    Last name : <%= f.text_field :last_name %>

<% end %>

Form_tag create basic form, 

<%= form_tag '/person' do -%>
  <%= text_field_tag "person", "first_name" %>
<% end -%>

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