some essential method to write in markdown

first article。

first article。

first article。

first article

first article

####### six # is no title

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first first first
two enters to quit this‘>’

library('tidyr')
detch('tidyr')
#they know what code i can write.

Tables	Are	Cool
col 3 is	right-aligned	$1600
col 2 is	centered	$12
zebra stripes	are neat	$1

if u want center：:-----:
if u want right-aligned：-----:
left-aligened:-----

-----:just as a dic
--------:yet i'm longer

webs of markdown

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收集了一些介绍markdown的网站，
1.简书:献给写作者的 Markdown 新手指南
2.简书：MarkDown使用教程