You asked

What is Basal Body Temperature and how do I use it to conceive?

Your basal body temperature is the lowest temperature of your body at rest. You can determine your basal body temperature by taking your temperature as soon as you wake up before you begin moving about. Do not get up to go to the bathroom or get a drink of water. Any activity will raise your BBT, which means you will not have accurate readings.
Ovulation brings about a slight shift in basal body temperature. It’s barely noticeable so in order to discern the slight elevation, you must be tracking your BBT daily.
Unfortunately, you will notice the spike in BBT a day or two after your ovulation has ended. A day or two after you have ovulated, your temperature will raise roughly a half or a full degree and it will stay elevated.
Sometimes women see their BBT rise slightly and think they have ovulated, but it is the consistently elevation that indicates ovulation has happened.
The value of determining your BBT and tracking it is that over several months, you can begin to see a pattern emerging. Tracking your BBT over time will show you the approximate time of ovulation each month. This will help you to know the best days of the month to conceive. 
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More questions

The best timing for pregnancy testing is once you miss your period.
Ectopic pregnancies are fertilized eggs which implant themselves outside of the uterus. They must be terminated and can indicate future fertility issues.
Ovulation is the period during which you can conceive. Tracking ovulation can be tricky, but you can increase your chances of conceiving through math, prediction kits, or simple scientific observation.
Implantation bleeding is not a common experience, but some women do report small amounts of blood with or without cramping roughly a week or less before their anticipated period.
Pregnancy tests are only as good as the execution. Read all instructions to avoid getting inaccurate results on a home pregnancy test.
The best over the counter kits measure luteinizing hormone (LH).
There are many things that you can do to increase your chances of getting pregnant.
How STD’s can affect your pregnancy, your baby and how you should deal with them during pregnancy.
Taking care of your body before and during pregnancy
Ovulation occurs just about two weeks after the first day of your period.