I found I was getting a lot of tangles and bird nests and I traced it to having the spool too full. I don't know what gear or rig you are using so please disregard if irrelevant but if you are using a spinning reel, it should be filled to 3/16 of the spool lip or almost full. I got in the habit of filling the spool to maximum capacity while doing mostly carp fishing and it works in that context because you aren't casting that much-but trout fishing is was tangle city because there is a lot more casting and activity so possibly that something to look at.
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