Quick links:
- 首次課程的 Feedback 表單
- 填完之後有 terminal, shell 的 demo codes 以及簡報連結喔
- Slido
- 上課簡報（另一個連結）
- 點名表單
什麼是 Markdown 呢？Markdown 是一種輕量的標記語言 (Markup Languages). 而所謂標記語言 (e.g. HTML (HyperText Markup Language), XML (eXtensible Markup Language), YAML (Yet Another Markup Language), TOML (Tom's Obvious Minimal Language), JSON (JavaScript Object Notation), TeX, ...) 通常是純文字文件，依據功能主要可以分為顯示用與資料序列化兩種。
顯示用的標記語言通常是個標準或規範，由於檔案本身是純文字，因此有可以 Text Editors 編輯、易於傳輸、方便採用版本控制等優點。純文字檔藉由根據標準實作的軟體或網頁後可以渲染 (rander) 成帶有格式的結果，缺點則包括不同電腦、軟體渲染的結果可能有所出入。
Markdown 的語法更接近人類的自然語言，可以藉由軟體或網頁轉換成更複雜的標記語言如 HTML, 再加以渲染。由於 Markdown 的簡潔、易讀等特性，現在已警備很廣泛的應用，包括 Discord, Telegram, Slack 等通訊軟體都支援部分行內 Markdown 語法，StackOverflow 家族的論壇、Reddit 等也都可以 Markdown 發文，軟體或 repo 的 README 檔，包括這份文件，現今也往往是 Markdown 格式，甚至還有很多工具可以把 Markdown 檔案們建置成 Blog, 電子書等。
由於 Markdown 是個自由的標準，也有許多衍生的版本，比如 GitHub-Favored Markdown 等等。
編寫 Markdown 原始碼時，因為是純文字而無法直接立即得到結果，與現今我們早已習慣的 Apple Pages, Microsoft Word 等 What You See Is What You Get (WYSIWYG) 所見即所得的編輯器有不小的差別。
現代大部分的 Text Editors 如 VS Code, Sublime, Atom, NotePad++ 應該多少會支援 Markdown, 以 VS Code 來說，按下 ⌘ Cmd (⌃ Ctrl if not macOS) + K 放開後再按一下 V就可以在側邊開啟即時預覽。有些軟體像是 Typora, Notion 是專門以 Markdown 來做筆記，但我就沒有研究。
線上網站包括 GitHub Gist, GitHub 都可以建立並顯示 Markdown 文件，HackMD 更方便還支援許多額外的擴充功能。
撰寫 Markdown 很像在寫一般純文字文件，有需求時利用語法來標記。注意段落之間需要有一個空行，結果才會換行。
大部分的時候 Markdown 都會被轉為 HTML, 因此也可以直接使用 HTML 語法。
一些行內標記，像是粗體、斜體、等寬字體、超連結、圖片等，以及不在標準但被廣泛實作的刪除線效果。
Wrap words in **two consecutive asterisks** or __two consecutive underscores__ to make them **bold**.
Wrap words in _single underscores_ or *single asterisks* to make them _Italic_.
**Bold** and _Italic_ could be combined nestly like _**this** one_.
Wrap words in `single backticks` to make them `inline codes (monospace font)`.
Create a link by putting the text you'd like to display inside brackets, then putting parentheses around the relative or absolute link, e.g. [my blog](https://nevikw39.cf).
Insert an image by an exclamation mark, brackets around text displayed when mouse hovered and parentheses wrapping the relative or absolute link to the image, e.g. 
Some Markdown renderers support to wrap words in ~~two consecutive tildes~~ to make them strikethrough.Wrap words in two consecutive asterisks or two consecutive underscores to make them bold.
Wrap words in single underscores or single asterisks to make them Italic.
Bold and Italic could be combined nestly like this one.
Wrap words in single backticks to make them inline codes (monospace font).
Create a link by putting the text you'd like to display inside brackets, then putting parentheses around the link, e.g. my blog.
Insert an image by an exclamation mark, brackets around text displayed when mouse hovered and parentheses wrapping the relative or absolute link to the image, e.g.
Some Markdown renderers support to wrap words in two consecutive tildes to make them strikethrough.
標題的語法有兩種風格，分別承襲自兩個標記語言 Setext, atx. 其中 Setext 只支援兩層標題，atx 則支援 HTML 的六層標題。
Put any numbe of `=` below a line to make it Setext header 1
===
Put any numbe of `-` below a line to make it Setext header 2
---
# Put a `#` at the beginning of a line to make it atx header 1
## Put two `#`s at the beginning of a line to make it atx header 2
### Put i `#`s at the beginning of a line to make it atx header iMarkdown 的有序與無序清單非常直觀。注意在最初標準中有序清單總是由 1 開始且其數字並不重要，但現在大部分實作也可以從其他數字開始。
- To start an unordered list, use either `-`, `+` or `*`.
- I'm another item.
* Nested lists are also supported by _indentation_.
- An item could be multiple lines.
Like this.
1. Put a number, a period and a space to start an ordered list.
1. In fact I'm the **second** one.
87. Then guess what number would be displayed before this line?- To start an unordered list, use either
-,+or*. - I'm another item.
- Nested lists are also supported by indentation.
- An item could be multiple lines. Like this.
- Put a number, a period and a space to start an ordered list.
- In fact I'm the second one.
- Then guess what number would be displayed before this line?
這裡介紹的 codes 區塊並不在最初標準中，但現今大部分 renderers 都支援三個 backticks 與語言種類（可以 highlight 程式碼）開啟區塊，再以三個 backticks 結束區塊。
```cpp
/** _ _ _____ ___
* _ __ _____ _(_) | ____ _|___ // _ \
* | '_ \ / _ \ \ / / | |/ /\ \ /\ / / |_ \ (_) |
* | | | | __/\ V /| | < \ V V / ___) \__, |
* |_| |_|\___| \_/ |_|_|\_\ \_/\_/ |____/ /_/
**/
#include <bits/extc++.h>
#ifndef nevikw39
#define nevikw39 cin.tie(nullptr)->sync_with_stdio(false)
#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector,fast-math")
#pragma GCC target("tune=native")
#else
#pragma message("hello, nevikw39")
#endif
#pragma message("GL; HF!")
using namespace std;
using namespace __gnu_cxx;
using namespace __gnu_pbds;
template <typename T, typename Cmp = greater<T>, typename Tag = pairing_heap_tag>
using _heap = __gnu_pbds::priority_queue<T, Cmp, Tag>;
template <typename K, typename M = null_type>
using _hash = gp_hash_table<K, M>;
template <typename K, typename M = null_type, typename Cmp = less<K>, typename T = rb_tree_tag>
using _tree = tree<K, M, Cmp, T, tree_order_statistics_node_update>;
int main()
{
nevikw39;
return 0;
}
```/** _ _ _____ ___
* _ __ _____ _(_) | ____ _|___ // _ \
* | '_ \ / _ \ \ / / | |/ /\ \ /\ / / |_ \ (_) |
* | | | | __/\ V /| | < \ V V / ___) \__, |
* |_| |_|\___| \_/ |_|_|\_\ \_/\_/ |____/ /_/
**/
#include <bits/extc++.h>
#ifndef nevikw39
#define nevikw39 cin.tie(nullptr)->sync_with_stdio(false)
#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector,fast-math")
#pragma GCC target("tune=native")
#else
#pragma message("hello, nevikw39")
#endif
#pragma message("GL; HF!")
#define ND second
using namespace std;
using namespace __gnu_cxx;
using namespace __gnu_pbds;
template <typename T, typename Cmp = greater<T>, typename Tag = pairing_heap_tag>
using _heap = __gnu_pbds::priority_queue<T, Cmp, Tag>;
template <typename K, typename M = null_type>
using _hash = gp_hash_table<K, M>;
template <typename K, typename M = null_type, typename Cmp = less<K>, typename T = rb_tree_tag>
using _tree = tree<K, M, Cmp, T, tree_order_statistics_node_update>;
int main()
{
nevikw39;
return 0;
}引用可以很多層，也可以結合其他語法。
> Ars longa, vita brevis
> > Ὁ βίος βραχύς, ἡ δὲ τέχνη μακρή
> I believe a leaf of grass is no less than the journey-work of the stars, \
> And the pismire is equally perfect, and a grain of sand, and the egg of the wren, \
> And the tree toad is a chef-d’œuvre for the highest, \
> And the running blackberry would adorn the parlours of heaven.
>
> _Walt Whitman_Ars longa, vita brevis
Ὁ βίος βραχύς, ἡ δὲ τέχνη μακρή
I believe a leaf of grass is no less than the journey-work of the stars,
And the pismire is equally perfect, and a grain of sand, and the egg of the wren,
And the tree toad is a chef-d’œuvre for the highest,
And the running blackberry would adorn the parlours of heaven.Walt Whitman
在 Markdowns 中畫表格就沒那麼容易惹⋯⋯
| Column 0 | Column 1 | Column 2 | Column 3 |
|-|:-|:-:|-:|
| No alignment specified. | Left | Center | Right || Column 0 | Column 1 | Column 2 | Column 3 |
|---|---|---|---|
| No alignment specified. | Left | Center | Right |
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