Favianos
Absolutely not a silly question because there various different changes and some things are more noticable than others.
The first change most boys actually notice is pubic hair. Usually, the first external sign that you could notice if you were looking for it, is an increase in testicle size.
In much more detail, puberty actually starts in the brain and a part of the brain called the hypothalamus starts making a hormone called GnRH. That acts on the pituitary gland (located within the brain not not really part of it) which then makes two more hormones: Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The names refer to the effects in girls, which I will come back to, but in boys LH causes cells in the testicles to make testosterone. Testosterone and FSH cause the testicles to start to make sperm and it is this that makes them grow. Then testosterone causes all of the other changes we associate with puberty.
Testosterone is responsible for the hair, in all the various places it starts to grow, including public, arm pit, happy trail, facial, chest etc. The issue with using hair to track progress through puberty, though, is that even fully developed some people are much hairier than others. Someone who is destined to be really hairy once fully adult may, when only half way through puberty, still be hairier than someone else who has just about finished puberty.
Testosterone is also responsible for penis growth. The fact we have one at all, rather than a clitoris, is because we had a higher level of testosterone when we were inside our mothers womb and without testosterone, it doesn’t grow, hence why it seems to be left behind as the rest of us grows during childhood prior to puberty, then suddenly grows fast once we get to puberty.
Then testosterone is also responsible for skeletal growth (via conversion to oestrogen), stopping growing, larynx growth (and hence voice change), oilier skin etc. It is also responsible for feeling horny and for making the glands that produce the non-sperm, liquid parts of our cum start to work, hence giving us the ability to ejaculate.
So, back to those weird hormone names that don’t make sense for boys. In girls, FSH stimulates the ovarian follicles to get an egg ready for ovulation. The stimulation also gets those follicles to produce estradiol (an oestrogen) which is responsible for much of girl puberty. LH induces ovulation and thus causes the ovarian follicle to become the corpus leteum (yellow body) hence the name.
