I highly recommend checking out the following resources:

• Mastering Bitcoin 2e (https://github.com/bitcoinbook/bitcoinbook#readme)
• Mastering Lightning (https://github.com/lnbook/lnbook#readme)
• Learn me a Bitcoin (https://learnmeabitcoin.com/)

@rheedio wrote this piece: A Crash Course in Lightning App Development which gives great tips. Linked to in the article is this tutorial: https://docs.lightning.engineering/lapps/guides/polar-lapps. If you're using lnd, I use ln-service to talk to SN's lnd node and would recommend it.

If you have specific questions, I'm sure I or someone else would try to point you in the right direction.