Use the bold tag on this. Use the strong tag on, "Hitler was wrong!"
Use the italics tag on this. Use the emphasis tag on, "Be prepared in the event of an earthquake."
This is regular text while this is small text.
Glucose plus Oxygen yields Carbon Dioxide and Water in a process known as respiration, or:

C6H12O6 + 6O2 → 6CO2 + 6H2O

When solving X2 + 5 = 41 remember to include both the positive and negative possibilities!
4X9Y8Z7 has a degree of 24.
Don't use underlines or the insert tag much so as not to confuse it with an hyperlink.
Sometimes we just can't think of the right thing to speak say.
If you made it this far you have made it to the end of the lesson.