Logstash Courses

Processing and Visualizing Logs With Elastic Stack
Coursera Project Network via Coursera

Data Processing with Logstash (and Filebeat)
Udemy

ELK Stack Training & Certification
Edureka

Microservices and Enterprise Application Development with Java and Spring Boot
YouTube

Installing the Elastic Stack
Pluralsight

Elasticsearch 7 for Beginners
YouTube

Elastic Stack Tutorial - Elasticsearch, Logstash, and Kibana
YouTube

Learn Elasticsearch
YouTube

Elasticsearch
YouTube

ElasticSearch, LogStash, Kibana ELK #1 - Learn ElasticSearch
Udemy