Basic [Venari Prime] build with no forma and no catalyst, for beginners who don't have much to use, without having to invest in niche mods. This build, with some adjustment, could be used for most beast companions with no issues too.

Not all mods are maxed; this build is designed without the need to grind for hours just to get endo. If you do have enough though, i recommend levelling Metal Fiber first as it'll be your most universal mod.

Mod Acquisition:

Animal Instinct

• You'll obtain them by completing Orokin Vaults on Deimos. If you're unsure what an Orokin Vault is, head over to YouTube, theres a great video by Brozime (not sure if I'll get deleted for linking it).

Bite and Maul

• Since they drop from Kubrows and Drahks, head over to E Prime on Earth and farm Kubrow dens.
  From the wiki,

  Equipping an unranked secondary (preferably something like the [Mk1-Furis] which deals only 11 damage per shot) and a moderate damaging weapon to kill Kubrow with, and traveling to E Prime seems the most efficient. Complete the objective and then return to any dens you find. you can gently click to shoot only one bullet at the den to trigger a new Kubrow. For maximization, dens take roughly 3 seconds before they can spawn a new Kubrow after taking damage, so alternating between two dens at once will generate more Kubrow at once.

Enhanced Vitality and Calculated Redirection

• Drops very commonly, Redirection from Cambion Drift, and Vitality from Corpus missions.

Fetch

• Chance to be dropped from most Hyena variants (Dog-like Corpus bots), head over to Fortuna in Venus and do assassination bounties in the Orb Vallis, given by Eudico.

Metal Fiber

• Similar to [Fetch], you can get them from Orb Vallis on Venus, except the fact that they're dropped by the Terra Crewmen (Orb Vallis versions of the normal Crewmen).