Asimplehuman

Go to hebrewbooks.org and download the laws of yichud by Nissim Dubov. On the same website download the book “The guarding of the brit and the guarding of the eyes”, after that download “Bilvavi, the time for fixing” on bilvavi.net. you can also just type on your browser “Bilvavi, time for fixing”, then go to scribd and download Veihaer Eineinu (Enlighten our eyes).
For women, now.
There is a certain website where you can download , Modesty an adornment for life by Eliyahu Falk. Good for both men and women. Though, I am very much anti-sheitels. I do not know if I am allowd to post the name of that website.
Watch the youtube channel “Just be Holy’.
You can also download it is a woman’s world from bilvavi.net. or you can just type “Bilvavi, woman’s wolrd” pdf
You can also go here https://www.beezrathashem.org/bh-e-books/tznius—dress-in-accordance-with-the-halochoh
About marriages, I recommend downloading “Bilvavi getting to know your family” from hebrewbooks.org
Go to judaica press and you can buy for less than 13$ a ebook on the lawd of shmirat einayim.
Rabbi Yisroel brog on Torah anytime has great lectures on Tznius. Just look up Rabbi Yisroel brog, and then search for Tznius

Kol Tuv