How can you help me at problem solving?

1) Take a problem that you come across online or your own study materials
2) write your understanding on it and come out with Pseudo code steps
3) Classify inputs and outputs required from the problem and name it.
4) Based on the Pseudo code come out with a function which in simple manner collects input and generate an output...you can write it in plain english.
5) Now select a language of choice (Python/Java/.NET/......) and then try to get basics of them....like variable handling, function creation....parameter handling....and then the visual display of the output..
6)This Pseudo code you can bring it in your language of Choice.
7) Important part is test your inputs and expected output...if that matches your initial Step 4) of analysis of inputs and outputs...then your logic is fine...else try to tune/re-work on the logic part..
Little detailed...hope this helps

I'm still wondering for more advices

You can try coding for yourself. The problem with relying on other people's exercises is that they don't necessarily build on what you already know. But if you code something up using just the skills you have, you can then push yourself to add something that requires learning a new skill.

You can also try later returning to prior problems whose solutions you saw and seeing if you remembered how to do them. If not, the next time you look at the solution, there will be less about it that is new and surprising. Keep this up, and eventually nothing will be new and surprising and you'll have solved the problem on your own.

I think the hardest thing about programming isn't the difficulty of problem solving. The hardest thing is learning to be patient with ourselves and never giving up. When you've mastered patience, you'll be a problem solving guru.