2019 兩岸清華暑期交流------平行程式與當地旅遊 為了記錄到北京清華交流，另外也想練習一下最近學的html/css 而架設的部落格 第一次網頁架設經驗。

Photos appear correctly on the computer but appear in the wrong rotation when you upload them to a website. The reason is the photos were from another phone, if he or she rotates on his or her phone, it seems to be on correct side, but actually it isn't.

jhead file.jpg

There maybe a line --- Orientation: 90 degree

jhead -norot file.jpg

此時照片就會顯示原本的樣子，再用小畫家等等轉正就完成了

In bootstrap's grid system, I should use

<img src="images/file.jpg" "class="col col-md-6">

or

<p class="col col-md-6">

for small screen users

When I new a repository for the github page, I pull the remote from the local in order to push it but there is an error saying " refusing to merge unrelated histories ".

git pull --allow-unrelated-histories