RoR routing error, No route matches [POST] - ruby-on-rails

Question

I'm a beginner in Rails, This is the rails guide blog app. After submitting the form I get No route matches [POST] "/articles/new" which is weird because as you can see from the routes below, articles/new doesn't have a post.
Controller file:
def new
#article = Article.new
end
def create
#article = Article.new(article_params)
if #article.save
redirect_to #article
else
render 'new'
end
end
def show
#article = Article.find(params[:id])
end
private
def article_params
params.require(:article).permit(:title, :text)
end
Routes file:
Rails.application.routes.draw do
get 'welcome/index'
root 'welcome#index'
resources :articles
Routes:
Prefix Verb URI Pattern Controller#Action
welcome_index GET /welcome/index(.:format) welcome#index
root GET / welcome#index
articles GET /articles(.:format) articles#index
POST /articles(.:format) articles#create
new_article GET /articles/new(.:format) articles#new
edit_article GET /articles/:id/edit(.:format) articles#edit
article GET /articles/:id(.:format) articles#show
PATCH /articles/:id(.:format) articles#update
PUT /articles/:id(.:format) articles#update
DELETE /articles/:id(.:format) articles#destroy
[EDIT] Here's the form also
<%= form_for :article, url: articles_path do |f| %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
</p>
<p>
<%=f.submit %>
</p>
<% end %>

Answer 1

Change the form helper to:
<%= form_for #article do |f| %>
You don't need to specify the url if it's the default controller action (articles#create)
Other option:
<%= form_for Article.new do |f| %>

Answer 2

As you're new to Rails, let me give you some ideas
form_for
The problem with this is down to your use of form_for
form_for basically creates a form out of an ActiveRecord object - allowing you to populate various attributes & other elements of the object with a standard method.
Part of this is to create a url component for the form, which will be built from the model_name attribute of your object. Typically, you'll populate the form_for with a pure ActiveRecord object; but as you've just used a symbol, it's going to cause a problem when looking for the url in the non-existent object:
--
Fix
The way to fix this is populate the form_for with an ActiveRecord object:
<%= form_for #article do |f| %>
You've already done most of the work for this - in your controller, you have to declare the #article variable in the new and create actions:
#app/controllers/articles_controller.rb
Class ArticlesController < ApplicationController
def new
#article = Article.new
end
def create
#article = Article.new(article_params)
#article.save
end
private
def article_params
parmas.require(:article).permit(:your, :attributes)
end
end