In many online notes or books on Latex, the fonts I found were using commands \sf, \sc, and \rm. Beyond this, I have no idea of other fonts. Here, I was trying to type a file in the following type of fonts.
How can I type in Latex with this type of font?
In the usual typing of my documents, the fonts look like this:


$...$or\( ... \). you need some basic introduction to tex input. there are some good suggestions here" What are good learning resources for a LaTeX beginner? – barbara beeton Jul 02 '16 at 13:40\sf,\sc,\bf,\rmetc. in LaTeX. They are 20+ years obsolete. – cfr Jul 03 '16 at 03:00