Learning from mistakes is how most of us do it

. Like I've said, there is no 1 right way for plants or fish. There are a ton of variables that can change things. You need to learn &
test to see what's going on in YOUR tank, tap water, plants & fish. I have pretty soft low KF & GH tap, so I need to add crushed coral to keep things fairly stable. I keep my lights on a timer so that's less of an issue. But I have high windows that can change things seasonally. It's always something!
We all have different tanks & issues but we'll try to help you with yours. I've lived in a few places with different conditions. I'm always learning after 40 years! That's part of the fun of our hobby

No big changes, go slow & don't panic! There are very few Defcon1 tank issues...But don't goof around before you ask us. Doing nothing can be devastating...or no big deal...
My best advice in general is to do fairly large weekly water changes. If something is wrong, water change! Not a wimpy amount, at least 30% or more. If you go on vacation, before & after water changes. Clean water can help with many problems. If you do it often you have some "slack" time when life gets in the way & you can't do them on schedule. Our fish & plants are pretty sturdy. They can adapt to slightly "lesser" care for a time.
Please post pics of your new plants, we may have advice, yeah likely we will.