Re: How to change TeX engine?

Well, first you need to understand few things about it:

As you should know, in the "traditional or classic approach" latex and
pdflatex can work with unicode with the package inputenc and the
option utf8, osmething like that:

\usepackage[utf8]{inputenc}

Additional you need to map the typography, so you need to add fontenc
with the correct set to map right the typography, for cyrillic is the
T5 set if I remember correctly, so after inputenc you should write:

\usepackage[T5]{fontenc}

And later the use of babel in the way you know.

The success in this case also depends on the package chosen (for
typography) has support for Cyrillic characters.

Now we can choose also xelatex and lualatex that work with unicode and
the truetype and opentype fonts. In this case we need to use the
fontspec package instead the inputenc and fontenc and also we need to
state the mainfont we want, the sansserif font (if we want), the
monospaced font and the mathfont. Here you can find a small example:

\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX, Scale=MatchLowercase}
\setmainfont{SourceSerifPro}
\setsansfont{SourceSansPro}
\setmonofont{SourceCodePro}

You can use the set of font you want in this way, but for this
approach will be correct you may need to set up your editor to use
lualatex or XeLaTeX instead of pdflatex and have no errors. Editors
like Texmaker or texstudio can do it without a problem.

Good luck

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