In Dragon Ball Super Episode 64, Future Trunks after watching Piccolo demonstrate how to use the Evil Containment Wave or The Mafuba technique on a video. Learned and successfully used it against Immortal Zamasu in his first attempt, without any form of practice or whatsoever.
Many fans found that a bit illogical because earlier on we see Goku learn the technique, but he wasn’t able to do it instantly. We don’t get the exact time he was training for it, but we see him learning it overnight, and It probably took around 6-8 hours.
So, how did Trunks ended up using it successfully in such a short time?
Firstly, even though Goku is really quick when it comes to learning a new move or technique. Trunks is supposed to be even more talented, he is a prodigy. And it’s a proven fact. Trunks achieved the Super Saiyan form with much less effort than Goku. Goku had been living in the wild, training and all ever since he was born. Trunks comparatively got so powerful with much lesser effort and training. Even in DBS, Trunks after training with Vegeta for a short period of time learned 2 of his signature moves Final Flash and Galick Gun. He is almost around the power level of Goku and Vegeta as he was able to fight Black and Zamasu alone while Goku and Vegeta at that point were struggling to do so, and had to return to the past. In terms of natural ability or talent to learn a technique Trunks already had the upper hand.
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