What are some of your lesser known tips and tricks?

Here are some that I know of:

You can add some cool customization to your loadout names by using special formatting. How to do this is on this post Here. You can also use this on Note Beacons to jazz up your dojo.

When starting a mission on the start chart you can press the pause button at the top left to enter matchmaking to guarantee you get teammates
There is one spot on Orb Vallis with a river that flows into a dead end, which piles up a massive amount of fish to easily catch

Ivara's dashwire can be put over a pond for easy fishing. You can even go partially into the water with it.
You can hold down void sling to go farther
Companion abilities can proc archon mods. Main use is Archon Stretch with Diriga's Arc Coil to give constant evergy regen
You can max Simaris standing in one zariman extermination bounty by stealth scanning enemies
Kuva/Tenet progenitors are base damage increases, not modded elemental. This means a magnetic Nukor will do the same heat proc damage as a heat Nukor