Try to understand the whole thing before implementing.
When we are junior, most of the times, in order to resolve an issue we look up just for the code, do a kind of copy/paste and continue, because the topic seems pretty hard at first glance, when we are senior we believe that it would be easy task and we don't investigate, read properly, etc and start implementing things, some hours later, we ended up deleting the code because it wouldn't work and start trying to understand the topic from scratch.
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Try to understand the whole thing before implementing.
When we are junior, most of the times, in order to resolve an issue we look up just for the code, do a kind of copy/paste and continue, because the topic seems pretty hard at first glance, when we are senior we believe that it would be easy task and we don't investigate, read properly, etc and start implementing things, some hours later, we ended up deleting the code because it wouldn't work and start trying to understand the topic from scratch.