You ask too many questions.
I find it too hard to remember whether to use "to" or "too" in a sentence.
He wanted to read but it was too dark.
somethings are too convoluted
Grab my portfolio, too.
Example sentence - The music was too loud to enjoy.
If it is the last word in the sentence than yes you would use the comma. Commas are so you could take a little rest between words. Examples: I like cotton candy, too! Your at this park, too? I can't believe you did this to me, too! You gossip, too?
If you want to lengthen your sentence, say, "Would you please use the word, "lengthen" in a sentence? (Check spelling, too)
Too many alternatives: use it in a sentence.
This environment is too hot and humid.
My chinos are fading too fast.
You are too late to start this job.
Your words are too frequently used; please use a dissimilar word. Apples and oranges are too dissimilar for the purposes of this comparison.