For training in the game Cs2 for prefire and standard entry practice, use the 5E_Prac map series – available for Mirage, Dust 2, Inferno, Ancient, Anubis, Vertigo, and Nuke. Each map allows you to practice entering both sites and learn how to take strong positions against your opponents. If you are using grenades, take CS2_Nades (guide with hints) and Training Blank Maps (maps without textures for testing grenade trajectories). The combination of these maps quickly turns confusing fights into proper ones with correct execution.
The maps are specially made for practicing enemy clearing around corners — from "long" on Dust 2 to "short" on Vertigo. Each map from the 5E_ series allows you to set bots into needed positions and try to defeat them efficiently.
5E_Prac — Mirage - here you can test how to correctly approach sites A and B. This map is perfect for remembering all positions.
5E_Prac - Dust 2 - helps you understand where you can be easily killed from, and where to move to remain unnoticed by enemies.
5E_Prac — Ancient - a map where every angle works against you, but you need to find the right spot to win them all!
5E_Prac - Anubis - a new map, just try it to discover something new in the game.
Try these maps to help your progress in Cs2 with expensive and rare skins.

Also available maps:
CS2_Nades (Mirage / Ancient / Anubis) - a convenient guide that shows where to aim, shoot, and stand. It has many functions like grenade flight visualization — you can see where your grenade goes. After such training, you'll easily remember how to use them!

Training Blank Maps (by Yprac/Refrag) - empty maps with unlimited grenades and flight path visualization. The best place to find new spots your enemies will appreciate!)

Combine these maps and you will succeed!