How do you work out if you can use multiple add-ons on the same Pi?

[HarveyAdcock]

I'm trying to automate my home using a Raspberry Pi, and know how to do several things I want individually, but would like to be able to do multiple things from a single Pi, or as few as possible anyway, but I can't find any info on which add-ons will work together or how to figure it out for myself. Can anyone help?

General answers that I can use to work out future conflicts/pairings would be ideal, but for specificity I'm trying to use both the pHAT DAC (https://shop.pimoroni.com/products/phat-dac) and the Pi-Mote (https://energenie4u.co.uk/catalogue/product/ENER002-2PI). From the documentation I've read on them both, they don't appear to use the same GPIO pins, but I'm not 100% sure about that, or even if those are the main/only concerns!

[DirkS]

Pinout is a great resource for GPIO information (https://pinout.xyz/)
Phat dac GPIO: https://pinout.xyz/pinout/phat_dac
Pimote GPIO: https://pinout.xyz/pinout/pi_mote

No overlap that I can see...

[Burngate]

General answers that I can use to work out future conflicts/pairings would be ideal

It's worth noting that you can only attach one HAT - they use pins 27 & 28 (I2C) to identify themselves.
Since the Pi-Mote isn't a HAT, attaching one to the Pi together with a pHAT DAC won't break that rule.

The biggest difficulty you may find is that they (and many other devices) have a socket that occupies most or all of the 40-pin header.
There are ways round that, but a soldering iron is often required.