Let's continue the 2nd group

23: Do foot matters in taking free kicks or corners?

Most people say it doesn't matter, however if foot has an effect in FK and Ck then I think it won't be important
24: Aerial defender is good in scoring during corner kicks?

I don't think so.

25: There is need to train defensive skills to attackers and vice versa?

Not all of them of course
In the new version you can see some highlighted defensive attributes for strikers like positioning

26: Backward arrow on defender and forward arrow on striker makes sense?
Yes, red arrow on a ST is soppused to make him more offensive so he should take part in defence less times and concentrate more in attacking
However I don't know if this really works or not.

27: Counter attacks does not works with short passes and high press?
Forcing counter attacks while high press would make your defence more weak so your defence won't be able to take the ball again to start a CA

28: The best striker is one who knows one-on-one soccer?
It all depends on formation and luck
If one-on-one ST was put in 4-5-1 v style he wouldn't perform well because your attacking midfielders are more likely to get the ball and shoot

29: It is better to have some experienced players rather than all young players?
There is no impact of age on player's performance
The only thing is can you afford to buy a full squad of nordgens or not.

30: Does form of last match decide performance in next match?
I don't think so. It only affects the morale of a player and morale in this game is not very important unless you have final match in cup for example so you have to do everything

31: Morale has any impact on player's performance?
Not a very important effect and it can be ignored in ordinary matches.

32: What is best way of choosing captian of squad?
Captain has no effect on your team even if you didn't choose one.
Now my gk is the captain, ck and penalty taker just for fun.

33: It is better to use easy tackles?How much we can save ourself from fouls by doing so?
A tackle system doesn't have an important role on decreasing fouls as I noticed.
However, maybe tackling attribute for defenders should be the most important to take less fouls as your tackles would succeed

34: What must be our bidding limit in auction to save ourself from bidding wars?
It depends on how many tokens you can earn.
Many token buyers don't have a limit but others have a limit and it is usually 5.
35: How morale of player's increases and decreases?
It depends on player's rating during matches.
Also at the start of every day your player's morale changes randomly.