Objectivity is a core principle of journalism. It is also difficult to achieve, particularly when exploring a complex issue critically. Every journalist should constantly work to improve their objectivity.
Sources
You need a wide range of reliable sources to understand a topic, and to ensure your audience trusts you. That includes gathering facts, but also listening to opinions from all sides. Ensure sources know how any quotations will be used.
Language
Some phrases are inherently biased. Avoid sensationalist language if you want to ensure clarity and objectivity. A journalism degree such as from https://schoolofjournalism.co.uk/ will help teach you to do this.
Headlines
Headlines are where it is most tempting to be dramatic. You need a clear, fact-based headline that helps summarise the general thrust of the story, otherwise you set the wrong tone for the rest of the piece.
No taking sides
This is very hard to maintain. Some would argue it is not always possible, but you do need to constantly remind yourself that you are not meant to be judging, but offering both sides a chance to express their views.
Framing
How you introduce the story, which sources you prioritise, how you balance quotations from different sides, and the format of your conclusion all influence the slant of your piece; whether it favours one side or gives equal weight to opposing views.
Objectivity may not be easy, but it is important if a news source is to be trusted and accurate. That means you need to think about anything that could impact your objectivity.