"Manners Maketh Man." Do you know what that means?

Yes.

It means that a good man will have manners.

Yes.

that
T͟Hat,T͟Hət/
pronoun
pronoun: that; pronoun: those

1.
used to identify a specific person or thing observed by the speaker.
"that's his wife over there"
referring to the more distant of two things near to the speaker (the other, if specified, being identified by “this”).
"this is stronger than that"
2.
referring to a specific thing previously mentioned, known, or understood.
"that's a good idea"
3.
used in singling out someone or something and ascribing a distinctive feature to them.
"it is part of human nature to be attracted to that which is aesthetically pleasing"
4.
used to introduce a defining or restrictive clause, especially one essential to identification.
instead of “which,” “who,” or “whom”.
"the book that I've just written"
instead of “when” after an expression of time.
"the year that Anna was born"

determiner
determiner: that; determiner: those

1.
used to identify a specific person or thing observed or heard by the speaker.
"look at that man there"
referring to the more distant of two things near to the speaker (the other, if specified, being identified by “this”).
2.
referring to a specific thing previously mentioned, known, or understood.
"he lived in Mysore at that time"
3.
used in singling out someone or something and ascribing a distinctive feature to them.
"I have always envied those people who make their own bread"
4.
referring to a specific person or thing assumed as understood or familiar to the person being addressed.
"where is that son of yours?"

adverb
adverb: that

1.
to such a degree; so.
"I would not go that far"
used with a gesture to indicate size.
"it was that big, perhaps even bigger"
informal
very.
"he wasn't that far away"

conjunction
conjunction: that

1.
introducing a subordinate clause expressing a statement or hypothesis.
"she said that she was satisfied"
expressing a reason or cause.
"he seemed pleased that I wanted to continue"
expressing a result.
"she was so tired that she couldn't think"
expressing a purpose, hope, or intention.
"we pray that the coming year may be a year of peace"
2.
literary
expressing a wish or regret.
"oh that he could be restored to health"

It means you can't spell there is no th at the end of make. Back to school with you

Yes, I do.

Liberals have no manners.

Manners