What's the difference between 入(root) and 人 (men) http://zhongwen.com/d/164/x74.htm

This character looks like 人 alot.

That website says that it's the character of roots descending into earth

I search for root in mgdb and can't find it.

I search for 入 and I found this
https://www.mdbg.net/chinese/dictionary?page=worddict&amp;wdrst=0&amp;wdqtm=0&amp;wdqcham=1&amp;wdqt=ru%0D%0A

What's the difference between 入and人?
They look almost the same to me. When inside other pics how do I know which one is which?
You can put them side by side on MDBG:


  


Where is the difference? Have a look:


  


You can see on the two circled parts that the right side of 入 actually slants a little to the left, where as 人 is generally left is left and right is right.