The game contain a variety of different currency, which some is easier to get while other might be harder.
Each currency must be collected using a Collect node, while the only exception is Token as it can only be gained as an reward from other mechanic.
Currency List:
Money
This is the starter currency, which allow you to purchase upgrades, or upgrading/tier up nodes
Token
This is premium currency that cannot be obtained through automated mean, and can be used to purchase perk or boost
Research Point
Currency that can be obtained from a Data Lab or Research node, and can be used for upgrade in further part of the game, or unlock feature with portal.
Hack Experience
This is a special currency that isn't visible on the main UI, but instead it only displayed on the Hacking tab and feature is progressively unlocked by a levelling system