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Yes you can but it very time consuming and you will miss some of important ones which you will get with the help of tools. Personally i Use MOZ pro to check the keyword difficulty and SEMRush to find...

You can create it using xml generators or for wordpress site you can use plugins . One sitemap will cover all of your links

Yes i agree with you. If a keyword you are using has low competition and you do on site seo correctly then possible you can rank on first. I had the same experience with one of my own Blog Post. even...