"Experiment and Adjust" in Path of Exile refers to the process of

Steps to Access Atlas Passive Skills
Reach the Endgame: First, you need to complete the main story and unlock the Atlas of Worlds. This becomes available after defeating the final boss of Act 10.
Complete Maps: Start running maps to Path of exile currency gain experience on the Atlas. As you complete maps, you'll fill in the Atlas and unlock more map tiers.
Earn Atlas Skill Points: For every 10% of your Atlas completed, you’ll earn an Atlas Skill Point. These points are used to unlock various Atlas Passive Skills.
Open the Atlas Panel: Press the "M" key to open the Atlas panel, where you can view your currently completed maps and see available passive skills.
Allocate Points: Click on the Atlas Passive Skill tree to POE buy currency see the skills available. Spend your earned points to unlock the skills that suit your playstyle and objectives.
Experiment and Adjust: As you progress, you can change your passive skills based on the maps you’re running and your farming strategy.

fine-tuning your character build, skill allocation, and gear based on your experiences and the challenges you encounter in the game. Here’s how you can effectively experiment and adjust your setup:

Steps to Experiment and Adjust
Try Different Builds:

Explore various skill gems and passive trees to find combinations that suit your playstyle.
Use resources like build guides or community forums to POE buy currency get inspiration.
Test Gear and Mods:

Equip different pieces of gear to see how they impact your damage, survivability, and overall effectiveness.
Pay attention to modifiers and synergies between items.