Many People dont know how to write a .md file so I fork the cheatsheet from somewhere else and put it here.
P.S. This cheatsheet is for hexo markdown.

Extremely Useful Plugin

Markdown all in one

Markdown all in one

Typora

Get the app here

Sequence Generate

Install hexo-filter-sequence

Code

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sequence
Alice->Bob: Hello Bob, how are you?
Note right of Bob: Bob thinks
Bob-->Alice: I am good thanks!

Output

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Alice->Bob: Hello Bob, how are you?
Note right of Bob: Bob thinks
Bob-->Alice: I am good thanks!
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A->B: ?

B->C: !

FlowChart Generate

Install hexo-filter-flowchart

Code

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flow
st=>start: Start|past:>http://www.google.com[blank]
e=>end: End:>http://www.google.com
op1=>operation: My Operation|past
op2=>operation: Stuff|current
sub1=>subroutine: My Subroutine|invalid
cond=>condition: Yes
or No?|approved:>http://www.google.com
c2=>condition: Good idea|rejected
io=>inputoutput: catch something...|request

st->op1(right)->cond
cond(yes, right)->c2
cond(no)->sub1(left)->op1
c2(yes)->io->e
c2(no)->op2->e

Output

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st=>start: Start|past:>http://www.google.com[blank]
e=>end: End:>http://www.google.com
op1=>operation: My Operation|past
op2=>operation: Stuff|current
sub1=>subroutine: My Subroutine|invalid
cond=>condition: Yes
or No?|approved:>http://www.google.com
c2=>condition: Good idea|rejected
io=>inputoutput: catch something...|request

st->op1(right)->cond
cond(yes, right)->c2
cond(no)->sub1(left)->op1
c2(yes)->io->e
c2(no)->op2->e

Font Awesome

Font Awesome

Hexo PDF

Install Hexo PDF

Normal PDF

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{% pdf http://7xov2f.com1.z0.glb.clouddn.com/bash_freshman.pdf %}

or

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{% pdf ./bash_freshman.pdf %}

Google drive

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{% pdf https://drive.google.com/file/d/0B6qSwdwPxPRdTEliX0dhQ2JfUEU/preview %}

Slideshare

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{% pdf http://www.slideshare.net/slideshow/embed_code/key/8Jl0hUt2OKUOOE %}

Preview

Katex

Install Katex

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$$
E = m * c^2
$$
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$E = m * c^2$

Output

E=m∗c2E = m * c^2

E=m∗c2E = m * c^2

Documentation Here

Latex Generator(similar to Katex)
Latex Online Generator2