One way to improve your Bible study is to be an active reader, notice what's in the text. One of the first things you'll notice are repeated words and phrases. For instance, Psalm 26:1 says ‘I have walked in my integrity'. Verse 3 says ‘I have walked in Your truth'. Verse 11- the next to last- says ‘I will walk in my integrity'. The Psalm begins and ends with walking in integrity.
From the dictionary (and last week's tip) integrity means a strict adherence to a moral code; genuineness, and your walk is how you conduct yourself through this life. ‘Your truth' from verse 3 tips us off as to what that code is.
So a key idea God wants to teach us in Psalm 26 is to live day by day with an honest, genuine commitment to His truth. (His truth is the ONLY truth, but that's another topic altogether.)
If God says something in His word, it's important. If He repeats Himself, then we should take notice.