: Save your entire OS before making changes.

The Samsung J2 Core (SM-J260 models) typically runs on 1GB of RAM, which can lead to lag. TWRP is considered the "best" recovery because it enables:

: Maintain at least 60-70% battery to prevent shutdown during the flash. How to Install TWRP on Samsung J2 Core Samsung Galaxy J2 Core (2018) – Telegram

: Download the Official Odin Flash Tool (v3.09 or newer) on a Windows PC.