Best practices when refering to above section
This section explains how the point-by-point problem description in section 1 maps to the point-by-point solution description above, in section 2.1.


Being unambiguous and adding redundant information is good, because you might very well make a mistake when writing one of the references (but it is unlikely to make the same same mistake with all of them), and the reader might make a mistake when reading the references (but this is less likely when there are several things all pointing to the same direction).

If your sections have names in addition to numbers, you may refer to them using both, if this is a good stylictic choice, or only the name or only the number. Do not, however, alternate between using only the section number and only the section name, as this will only confuse the reader, who might not realize that the name and the number point to the same thing.