Harmonic Series sums to One?

Question

I don't get it. How does $\sum_{j=1}^m\frac{1}{m}=1$? This looks like a harmonic series. I got this from brilliant.org, the website that trains students for AMC, AIME, Olympiad type of problems. This was the original problem: and this was the solution:
I just don't get this part: I deeply apologize if its something trivial. Its been a while since my last math class in linear algebra. Any hint would be appriciated!

Answer 1

$$\sum_{j=1}^m\frac1m\ne\sum_{j=1}^m\frac1j.$$

Answer 2

$$\sum_{j=1}^m\frac1m=\overbrace{\frac1m+\frac1m+\cdots+\frac1m}^{m\text{ times}}=1$$