Do you understand the minimization that happened in the sketch?
Note the column where BC = 11. The vertical encirclement shows that as long as B=1 and C=1, it doesn't matter what A equals. So the output term is B&C
The bottom left encirclement shows that as long as A=1 and C=1, it doesn't matter what B equals. So the output term in A&C
The bottom right encirclement shows that as long as A=1 and B=1, it doesn't matter what C equals, The output term is A&B.
Combining the 3 terms (from the 3 loops) we get B&C + A&C + A&B
There are hundreds of videos on the subject plus many other tutorials. Google can help!