Unfortunately, honest questions are indistinguishable from the horde of transphobes spreading misinformation and sowing uncertainty under the guise of "just asking questions" (sealioning).
If you are genuinely curious, then I recommend starting with the Wikipedia article on puberty blockers, and also reading the one on precocious puberty which is a condition in very young children that is treated by the same drugs. (Tellingly, this usage is non-controversial and exempted from all of the new laws banning puberty blockers for trans children.)
True, but it's still the right thing to do. At the very least it will force some members of Congress to clearly and undeniably declare themselves as supporters of tyranny.