Beginner's Guide to Seven, originally published by Venenu on YouTube, edited slightly by me.
If significantly winning the lane, skip Basic Magazine and Sprint Boots and get Tesla Bullets as soon as possible. Take Spirit Lifesteal sooner to gain tankiness. When enemy pushes in lane, stun with 2, follow with 1 for slow/damage, pop 3 for aggressive kill or the fully push them out.
If you still need tankiness after taking Spirit Lifesteal early, take Healing Booster, otherwise skip to Soul Shredder Bullets. Take Enduring Speed earlier (after Fleetfoot) if needed. Ethereal Shift is a combo (E - Fleetfoot - Ethereal Shift to reload - finish fight) OR Surge of Power (E)
Leech if you are ahead, Soul Rebirth if not. Boundless Spirit > Soul Rebirth > Unstoppable for general use. Boundless Spirit > Unstoppable > Spiritual Overflow if you are really strong. Boundless Spirit > Unstoppable > Escalating Exposure against tanky enemies. Boundless Spirit > Leech > Soul Rebirth if you are extremely ahead.