Eight skills

Fishing training

Player guide

Starting out
Use a rod in water and reel in successful catches.
Missed casts and hooked entities do not count.
Check Fishing after a few catches.

Building your skill
Read the actual perk effect before buying by name.
Keep a working rod and use completed catches for today's task if offered.
Your pace card explains the active progression mode.

Long-term goals
Compare XP bonuses for your available slots.
Track catch actions for higher relic tiers.
Inspect catches before deciding what to keep or sell.

In Minecraft: open /skills, choose Fishing and read How to Train. Its live cards show accepted rates and requirements.