A good task management system should allow you to:

• create tasks
• categorize tasks, like grouping them together
• manage priorities, to identify which tasks are most important or need immediate attention
• put tasks on hold while you are waiting for answers
• archive your tasks so that you can remember what you have done
• access and manage your tasks from various devices and platforms, including mobile phones

All of these things can be done using a word processor or spreadsheet, if you want a personal task management system. However, you might want optional or advanced features. 

Optional features are:

• due dates and reminders to ensure that tasks are completed on time by receiving notifications when a deadline is approaching
• a collaboration feature to see tasks and priorities for other members of the team and track their pending or completed tasks.
• integration to link your task management system with your calendar, email, etc

Examples of some personal task management systems you can try:

• Thunderbird tasks
• Google Tasks
• MS To do App
• Joplin
• todoist.com
• Evernote

Here are some collaborative task management systems:

• Trello
• Monday.com (task management, project management, time management and team collaboration)
• Jira
• Asana
• Notion.so
• Smartsheet.com
• ClickUp

Videos you might want to watch:

IT Connect Online 2021 Steve Pence's Top 10 Tips Part 1

IT Connect Online 2021 Steve Pence's Top 10 Tips Part 2