Below are some preparedness resources:

Joint Ransomware Guide (CISA and Multi-State Information Sharing and Analysis Center)
CISA Ransomware Webpage: Ransomware Guidance and Resources 
CISA Insights: Ransomware Outbreak 
CISA Pipeline Cybersecurity Initiative 
CISA Pipeline Cybersecurity Resources Library 
Cybersecurity Workforce Training Guide
Cyber Security Tabletop Exercises: Templates and Scenarios
CISA Shields Up Website
Shields Up | CISA
This page consolidates CISA’s published resources on cyber threats related to the current geopolitical tensions. It is designed to help critical infrastructure owners and operators mitigate possible cyber threats and strengthen their cybersecurity posture. 
Known Exploited Vulnerabilities Catalog
Known Exploited Vulnerabilities Catalog | CISA
A living list of vulnerabilities which have been known to be exploited.  It was recently updated to include CVE-2022-23131 Zabbix Frontend Authentication Bypass Vulnerability and CVE-2022-23134 Zabbix Frontend Improper Access Control Vulnerability.
CISA Catalog of Free Cybersecurity Services and Tools 
Free Cybersecurity Services and Tools | CISA
A list of CISA services, non-proprietary software tools available online, and free services offered by trusted private sector partners. 
CISA Cyber Resource Hub 
Cyber Resource Hub | CISA
A comprehensive list of the no-cost cybersecurity assessments CISA offers upon request to help organizations evaluate operational resilience, cybersecurity practices, organizational management of external dependencies, and other key elements of a robust and resilient cyber framework.