As I plant to use the following packages and commands, are there some obsolete ones :
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\usepackage[utf8]{inputenc}\usepackage{babel}\usepackage{geometry}\usepackage{ragged2e}\usepackage{amsmath}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsthm}\usepackage{bbm}\usepackage{cancel}\usepackage{enumitem}\usepackage{multicol}\usepackage{pgfplots}\usepackage{tikz}\usetikzlibrary{plotmarks}
Also, if I remeber well, you recommend the use of
empheq
environment for equations. Generally, how to know when a package is obsolete except asking ?