How do I know whether I need it.
I think the guiding principle here is "if you need to ask, you probably
have no use for it. Yet."
Here is the metaphor I think is applicable here. Can you dig a ditch
using your spade? Would an excavator help? Not really, if a ditch is
but a few feet long and a foot deep and the soil is loose and light.
You would only use an excavator if the amount of work warrants it. Of
course, if you already have an excavator on site, using it to move even
a bit of earth costs you almost nothing and can save some time, compared
to digging with a spade, even a mere few cubic feet of dirt.
Read about Boost, learn about the problems people solved using it. Some
here might tell you about it, but using Boost's online forum is probably
more effective. If you find that you can solve some problem with it,
then get it, invest some time learning it. Or don't.
V