A producer told me that if want to use both a reverb and delay, i should put the delay first, so that its feedback does not clash with the decay of the reverb. Does the effects order you add to a sound in the mixer when producing matter?
In general the order matters a great deal. You'd generally want your chain to go something like Filters/EQ -> Compression -> Time effects (Reverb/Delay). EQ first because you usually wouldn't want to be compressing frequencies that aren't going to be there after passing through the EQ.
Specifically with Reverb / Delay that would probably come down to personal preference. But then honestly all of this does; there are good general guidelines.