Two
The kanji two and the radical two are the exact same things. Therefore, you know the kanji for two already!
More simply put, you can just know that this kanji is the double of one. It's two lines, that's not all that hard to remember!
に
ふた
None
How do you count to two? Just use someone's knee (に), and then their other knee. There — two knees!
Imagine asking to borrow the two knees of a stranger in the street, just so you can count to two. They're confused at first, but then they present each knee to you in a loving sort of way. Yep, that's two knees alright.