Some Questions from an SEO Beginner

Hey guys, I'm just starting out in SEO. Still learning the bare bones. I'm a beginner who's learning to get a job as soon as possible

I have some general questions in SEO which I'll like to ask

1) Can I practice my SEO skills on a ". wordpress" domain. Also, how presentable is it on a portfolio

2) What generally should be on the portfolio of a beginner who is applying for jobs

3) How important are premium SEO tools to a beginner? Can I get a job with work done using free tools