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.
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?
Example sentence - The music was too loud to enjoy.
somethings are too convoluted
Grab my portfolio, 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.