This section will contain terms referring to genitals in an educational context. There are also mild references to sexual activities, also in an educational context.

It is important to note that the anatomy of individuals varies from person to person. Below are different terms so you know what is what. Keep in mind that not everyone looks the same.

For the trans-masc procedure to remove this area, see vaginectomy.
For the trans-fem procedure to create this area, see vaginoplasty.

• Labia - Folds of skin around the vaginal opening.
• Labia Majora - outer lips
• Labia Minora - inner lips.
• Clitoris - Located at the top of the vulva, the clit is an extremely sensitive gland. When aroused, it will become enlarged and erect.
• Clitoral Hood - Skin covering the clitoral hood. Can be pushed back for direct access.Urethra - The pee hole. Located below the clitoris and above the vaginal opening. It is typically a small hole.
• Vaginal Opening - Located below the urethra, this hole is where menstrual blood comes out for most AFABs. It is a separate hole from the aforementioned urethra.
  Pee does not come out of the vagina.
  Typically self-lubricating.
  Certain products exist in an effort to "improve the smell" and also shame women. These products are excellent if you are looking to lower your self-worth, and give yourself a yeast infection. If this area smells off, go to a doctor, not the beauty section of the grocery store.
  The vagina is not somewhere you need to clean. It cleans itself. Putting products in there will mess with your PH balance. Clean the rest of your vulva using water and a mild/gentle soap to stay sanitary, but don't put anything inside yourself that shouldn't be in there.
• Mons pubis - While not technically part of the vulva, I am including it here as it is located nearby. This refers to the fleshy mound above the vulva which cushions the pelvic area. It tends to get hairy after puberty.
• Anus - While not technically part of the vulva, I am including it here as it is located nearby, below the vaginal opening.
  Not self-lubricating.
  Remember to use a flared base, unless you feel like explaining yourself to a doctor in the emergency room.

When a trans-masculine individual goes on testosterone, this can cause various genital changes. Quite often, these are some of the first reported changes.One of said changes is enlargement of the clitoris, commonly referred to as "bottom growth." Size of bottom growth varies from person to person. How long it will get, and when it will stop growing depend on the person.
Some report that bottom growth can be painful as it can chafe against clothing, but this varies from person to person.

Bottom growth is often (but not always) a prerequisite for surgeries such as phalloplasty and metoidioplasty, as it will give the surgeon more to work with.
It is possible to enhance bottom growth through the use of pumping devices. Some people will talk to their endocrinologist to get a specialized cream to enhance bottom growth. Some people who take their HRT in gel form may think about putting it on their genitals to do this. As t-gel is alcohol based and has the consistency of hand sanitizer, this is a bad idea. Not only will it not work, but it will cause an extremely uncomfortable burning sensation.
Bottom growth typically cannot be used for penetration, however it can be used for oral. Some trans-masculine individuals report that it can get up to or even surpass 2 inches in length. Visually, it can look like a small penis, however this can vary from person to person.

The area between the clitoris and the clitoral hood should be cleaned frequently. This area is sensitive, and can be painful to touch when dry, but it is necessary to clean it to remain sanitary.

Taking HRT can cause what is referred to as vaginal atrophy, referring to a dry vagina. The severity of this will vary from person to person, and will not necessarily happen.
It is important to note that atrophy can happen to people regardless of if they are on HRT or not. This can happen to anyone, cis or trans, due to various reasons. Some individuals will talk to an endocrinologist to get a specialized hormonal medication to help with this issue. Plenty of others will use lube.
Regardless of who you are and what you are doing, improper lubricant during penetration can result in tearing, pain, and potentially future health complications.
There is no shame in having to use lube. Just have fun.

Folx Health - How to maximize bottom growth
Mayo Clinic - Vulva
planned parenthood - female sexual anatomy
Very Well Health - The Anatomy of the Vulva