Never pull on a banner unless you have enough Visiore to hit the pity bar (usually 36,000–42,000 Visiore). Randomly throwing 2,000 Visiore at every new unit is the fastest way to stay weak.
Downloading "hacked" files from untrusted sources often introduces malware to your device.
New players often focus on Units, but Vision Cards are the true power-up. A maxed-out Vision Card provides party-wide buffs that are essential for high-level content.