Identifying kw's with no tool

[SearchEngineLabs]

Without Tool we can't get Perfect Keywords for our website , Atleast should use free tool for keyword Analysis.
OR else

Should do competitor Analysis of your competitors you can get some ideas regarding the keywords that are ranking your competitors well in SERP's.

ps: some of the free tools are:
1) Google Keyword Planner
2) small seo tools
3) uber suggest
4) keywords Everywhere