During the adventure in The Last Guardian it is possible, at times, to be confused, without knowing what to do or where to go. However, not many people know that there are suggestions on what to do.
You can get in-game tips through meditation. Remember that you will need to stand on a flat surface to meditate. pressing R3 and L3. This way you will get a hint. Even if you meditate multiple times in the same location, however, you won't get more than one hint. There are some that can only be "unlocked" by waiting in an area or walking around.
In fact, many of the suggestions are given when you have no idea how to proceed and you go for a walk without progressing: in this way we will have "clues" automatically. As there is a trophy, in regards to suggestions, we still recommend that you meditate whenever you can and hang around for a while for each new location you visit.
Some suggestions may also appear in different locations, so it is also possible that we will hear a suggestion several times even if it is not necessary at the end of obtaining the trophy.
Other clues can be received by performing particular actions, for example when at the beginning of the game we will give the barrels to Trico, staying close to him, a hint will appear that will tell us that Trico will not eat until we have moved away. Another example we can have immediately after, when, after eating, without having freed Trico, we will be told that the beast is better but that it is still impeded in its movements.
It is therefore advisable to take every action calmly and thinking, in order to receive all possible suggestions.
Other useful guides:
Trophy Guide
How to get the real ending
How to get all the costumes
Check Trico better