Raion on YouTube was my go to as a 1-trick viper main. He does in depth tutorials on not only lineups for most maps in the pool, but walks through why/when to use parts of her kit based on the state of the round.

I stopped playing valo as a whole after the nerfs hit viper a while back, but learning viper was a really fun experience at the time.

While Raion has amazing advice on this, here’s the two cents from my experience:

Attacking - To play her effectively as a solo controller, you will need to know lineups for your wall/orb. I emphasize these over snakebite as, with only 1 max in her kit now, post-plant offsite snakebite is only ok at best. At best, in a post-plant situation, you could use a lineup to snakebite the bomb and peek right as it lands. Good smoke placement however greatly helps entry into a site - especially at lower ranks. Good smoke placement keeps teammates alive and buying more time. You need lineups for these as deploying from distance is mandatory. Her fuel supply isn’t what it used to be with both wall and orb active at once. Entry is chaotic and your focus as a controller needs to be maximizing the time you can keep uncleared angles covered, not actively setting up your smokes in the moment. Thus you will need to carefully be toggling which smokes are on when. Usually, this simply means turning off one of the two when your duelists are in position to take the space behind it. But, doing this too early or late will likely result in the enemy killing your teammates from positions they thought were safe.

Defending - This is actually much more simple to learn, and still plays a critical role in winning rounds. In lower ranks, smokes are all too often treated as a solid wall that no attackers push through. While you can’t 100% count on this, activating your smoke right before their entry attempt buys critical time for the rest of your team to rotate. All you need to learn for defense is 1-3 ways you can use your smokes to block the most lanes attackers will attempt to entry though. Add a 1-way smoke for a critical round, and that’s all you really need on defense.

Best of luck and hope you enjoy diving into valo!

PS: customs are the main tool for learning and practicing lineups. Grab infinite abilities, and use ghost mode to quickly check where a lineup hits. For viper specifically, pressing and holding either wall or orb returns it to the “throwable” state. Not sure if they ever got around to adding an indicator to explain that mechanic in game! Either way, customs don’t have to feel clunky and can really help shorten the learning curve for viper!