LaTeX snippets

stopping hyphenation

\hyphenpenalty 10000
\exhyphenpenalty 5000

more: https://texfaq.org/FAQ-hyphoff

line break in a table cell

\shortstack, in the corresponding cell, \shortstack{a \\ b}

or makecell package.

more:

https://tex.stackexchange.com/questions/2441/how-to-add-a-forced-line-break-inside-a-table-cell

https://tex.stackexchange.com/questions/331716/newline-in-multirow-environment

figure/table occupying two columns

use \begin{figure*} environment rather than \begin{figure}.

more:

https://tex.stackexchange.com/questions/235623/placing-a-figure-in-the-bottom-of-a-page-spanning-the-two-columns-of-an-ieee-doc

https://stackoverflow.com/questions/1856189/fullpage-picture-in-two-column-layout

line numbers missing for paragraph with equations followed

wrap the math environment by \begin{linenomath}  and \end{linenomath}, use linenomath* if the math equations also need to be line numbered

more:

https://tex.stackexchange.com/questions/25784/why-doesnt-lineno-number-a-paragraph-when-it-is-followed-by-an-indented-equatio

registered trademark symbol (encircled R)

 \usepackage[T1]{fontenc}

then use it as \textsuperscript{\textregistered}.