2. Consider beats, bars, and phrases of tracks.
4 beats to a bar, and 8 bars to a phrase more often than not. new elements to a track are usually brought in when transitioning to a new phrase, (a synth, drumbeat, piano, guitar riff, chorus, breakdown, whatever)
Listen to this random track i just lifted off soundcloud (by searching for 'phrases'

and note the phrases every 8 bars.
to begin with, try dropping the first beat of the phrase in your incoming track over the first beat in the phrase of your outgoing track, and try to be mixed entirely into the new track just as the next phrase hits.
Once you know your tracks particularly well, and gain more confidence, you'll start to do this naturally, our brains are programmed to 'expect' this style of phrasing and anything falling outside this tends to just not sound right.
hope this was helpful
EDIT: Oh, also, if your mix sounds good together, (more likely if the tracks are in the same or similar key) then by all means leave them running together for a while, no need to mix out so fast, maybe just adjust the EQ a bit so you get the hight/mid/low from the tracks sounding good together. If you do this, just keep an eye on the beatmatching though, as the tracks will drift over time, and may need a nudge to stay matched. (unless you're using software that will do this for you)
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