https://forumserver.twoplustwo.com/7...hreads-672024/
and the rest of the concepts,
http://forumserver.twoplustwo.com/78...ntents-397190/
but dont start applying everything you read instantly, start with learning how to build a range of cards that you raise when you're first to act, start to think about why you would call with what cards in which positions (tip: there's not that many) but you need a preflop calling range otherwise you leave money on the table,.
Once you feel like you know why you can raise K9o and it being a good hand to be aiming at the blinds, and why sometimes you would rather have 75s vs the blinds.
You'll understand what you are trying to exchieve post flop with the cards you choose pre.
Than re read all the stuff on the site, PLAY, play lots, watch the hands play one table and only one table till you are not losing.
Become a winner, than a loser, than a winner and hopefully eventually just a winner,.
Enjoy.
Hope this helps you on ur path