As SEO goes through various changes your "briefcase" to get the job done should include a variety of SEO tools.
The SEO tools I recommend for your briefcase are varied and fall under a few categories. On a broader scope there are free and paid SEO briefcase items. There are single task and multitask tools as well.
Since my goal is to focus first and foremost on the Beginners, this list if items to put into your SEO briefcase will start there. You can add tools in the comments, but if you don't you can still enjoy this list.
I will do my best to either create guides or share links for guide that walk through using these items
SEO 4 BEGINNERS: First Chapter