Hey,
I think the "Keyword explorer" tool.
I am gonna try to explain my process:
(I have a Pro Membership)
Step1: research popular keywords on Youtube.
Step 2: Write in a document a few points about what I wanna say in the video
Step 3: Record the video
Step 4: Edit the video
Step 5: Make a PERFECT thumbnail
Step 6: SEO Studio of Tubebuddy and I follow the steps and try to add my SEO Score as high as possible (With tags in the title, in the description in the tag itself, Upload the Thumbnail, etc.)
Step7: I Upload the video to my Channel, And I add the Things from the SEO Studio to My video.
Step 8: I place the video online and I run the "best practices" on that video to check If I did everything well.
These are the steps that I take for a video of mine.
I am still learning every day about Tubebuddy and Youtube SEO.
So it can be that there are better things to do first or even more steps to take, to make your video even better.
I am always open to get feedback!