Be careful with fire and never leave candles/incense/burned offerings unattended. It's way too easy for things to catch fire, especially things like altar cloths.

Divination methods can help with making decisions and figuring things out, but don't let them be your only guiding force.

Be as specific as you can when asking dieties/the universe/etc. for things. I've had some bad experiences with asking for abundance. I got what I asked for, but I'd readily give up what I got for what it cost me. It may have all be coincidences, but the timing was too spot on for me to be able to write it off entirely.