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Use:-
Google webmasters
Google Analytics
Google Keyword Planner
Yoast SEO
Ahref
Google Trends
We could use all these.
Create page titles. Keyword-based titles help establish page theme and direction for your keywords.Place strategic search phrases on pages. ...Develop new sitemaps for Google and Bing. ...Submit website to directories keyword planner its free you can use screaming frog which a tool its usefull buzzmo and other sites are paid services
There are different types of off page seo tools are available . for example if you want to explore your competitor Backlinks so I will suggest Moz explorer which is free & paid from free version you analyize some of links of your competitors . to explore more you will need to buy paid version of that . same like for other purpose there many tools available to explorer other contents , guest blogging and etc
