the point is...

(じゅうてん) The point. Used for emphasis – “The point is...” The one thing you have to remember is...
 
(ようてん) The important points (unlike 重点(じゅうてん), 要点 can be more than one point – the emphasis is that 要点 is a summary. Like instead of writing an essay, you’d just do a series of bullet points. Example: 要点だけ話して! (“Get to the point!”)   $$$
 
(しょうてん) Literally, a focal point. Figuratively, the point of someone’s conversation. However it’s more general than 重点. 焦点 is more like “the gist” “the purpose”, rather than one single central fact. Examples:焦点があいまい (What was her point?)  焦点がボケてる! (His speech was totally pointless!)