Once you get the hang of it, the builder does internal calculations, has BJCP categories to keep you in bounds for various styles, a great IBU calculator for hops, and so on. The first few times while you figure out your efficiency you may have some misses.
One thing you can do before you start is figure out your 1 hour boil off rate. Start with nn gallons of water, boil 1 hour as you would brewing a beer, at 1 hour stop, measure how much water is left. That difference your boil off rate. You plug that into the recipe editor and it will calculate your expected gravity of the wort post boil.
here is a fairly simple pale ale I did that worked out really well:
https://www.brewersfriend.com/homebrew/recipe/view/1576426/lutra-ipa
- the rye is optional, and can be a difficult grain to work with in volume, but I like the contribution.
- yeast is Lutra Kveik. great in hot temps and with no temp control, works from about 70F - 95F, clean fermenting.
- hops are also flexible, you could use what you have on hand.
- maris otter could be subbed out for peasant 2 row malt.
if you're into pales, you can grab this, copy and make it your own.