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+---
+layout: post
+title: Welcome to Jekyll!
+author: Jeffrey
+categories: jekyll
+tags: jekyll theme yat
+---
+
+You’ll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run `jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.
+
+To add new posts, simply add a file in the `_posts` directory that follows the convention `YYYY-MM-DD-name-of-post.ext` and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.
+
+## section 1
+Jekyll also offers powerful support for code snippets:
+
+{% highlight ruby %}
+def print_hi(name)
+puts "Hi, #{name}"
+end
+print_hi('Tom')
+#=> prints 'Hi, Tom' to STDOUT.
+{% endhighlight %}
+
+## section 2
+### section 2.1
+### section 2.2
+#### section 2.2.1
+##### section 2.2.1.1
+#### section 2.2.2
+##### section 2.2.2.1
+
+123
+
+## section 3
+### section 3.1
+### section 3.2
+### section 3.3
+## section 4
+## section 5
+
+Check out the [Jekyll docs][jekyll-docs] for more info on how to get the most out of Jekyll. File all bugs/feature requests at [Jekyll’s GitHub repo][jekyll-gh]. If you have questions, you can ask them on [Jekyll Talk][jekyll-talk].
+
+[jekyll-docs]: https://jekyllrb.com/docs/home
+[jekyll-gh]: https://github.com/jekyll/jekyll
+[jekyll-talk]: https://talk.jekyllrb.com/
+
+$ a * b = c ^ b $
+
+$ 2^{\frac{n-1}{3}} $
+
+$ \int\_a^b f(x)\,dx. $
+
+```cpp
+#include <iostream>
+using namespace std;
+
+int main() {
+  cout << "Hello World!";
+  return 0;
+}
+// prints 'Hi, Tom' to STDOUT.
+```
+
+```python
+class Person:
+  def __init__(self, name, age):
+    self.name = name
+    self.age = age
+
+p1 = Person("John", 36)
+
+print(p1.name)
+print(p1.age)
+```