This advices are based on my 36 season experience of leading various clubs on levels 1-24 and some levels were repeated.
They are written in order to adapt tactics to counter your opponent.
There is no universal tactic, that is why we can adjust it Tactics should improve effectiveness of your teams stats. If your team performs bad, remember to check other factors (like form or morale), everything is important, more or less.
Also I would like to invite other experienced players to post their experienced based on various tactics and share with us additional informations and suggestions. Feedback always helps
Mentality
-normal: This is my 1st choice to start match, provides balance between attack and defence, and I usually don't change it if match develops well. During the match I change it if needed to other tactics:
-attacking: I use it against much weaker teams or when my needs goal, but still has enough time to catch result.
-defensive: I use it during when my team has lead and opponent is strong and uses offensive setup to try to catch result.
-very attacking/very defensive: I use it only in last 10 minutes of the match if me/opponent is desperate to score. Those 2 tactics are very risky.
Pressing
I usually use low pressing. High pressing is good when you use offensive formation while opponent has 5 or more players on his side of the pitch. It could also be useful against much weaker teams than yours. It is also risky tactic because gives opponent space for counterattack.
Tackling
-normal: regulary used, usually against weaker teams or against stronger ones when my team has too much fouls and cards.
-hard: good against strong teams, could cause more fouls and cards.
-easy: can't remember when I used it, could be useful when you have high score and you don't want your players booked
Marking
-I usually use zonal, I sometimes change it to man-to-man when opponent is much weaker so that my players. Some players claim that for them MTM marking is more effective than zonal, so I think it is individual. My team Dnipro has received only 2 goals in last 8 matches with zonal defence, so I stay loyal to it.
Passing
Before any passing suggestion, you need to remember to check completed passes % during the match. If it is around 80% or less (after 10-15mins, not in 1st 5min), then change passing settings.
FOCUS
-mixed: against balanced formations like classic 442
-through flanks: against formations with 2-3 wingers (narrow formations with strong centre)
-through middle: against formations which have 1 or 2 central mildfielders (not only MC, also AMC and DMC counted). In this case my counter formation usually has 3-4 central mildfielders.
LENGHT/STYLE
-mixed: my most often choice, suits to most formations and counters
-short: used usually when my completed passes % is weak and against strong teams whose formation has up to 4 mildfielders
-long: used usually when my opponent is strong and has 5 mildfielders formation and/or when opponent has 3 defenders formation.
Some formations have specific passing focus settings, so for example:
-narrow formations like N.diamond or 43N3, usually work best with mixed passing. You don't need to focus it through middle because it is middle-focused formation by default. I've noticed that mixed passing with narrow formation is more effective than through middle.
-2 central mildfielder formations works with mixed or through flanks passing. Through middle shouldn't be combined with these formations.
Force counterattacks
I have to admit that I don't use force counterattacks (CA) button at all. Why? Because I've noticed that fair amount of CA's have been broken, but worse is that then opponent starts CA against team whose CA was broken. Do not force CA when you play offensive! Force CA should be used when defending.
Offside trap
It is useful when you use 3DC defence with offensive formation, whole pitch pressing and you face weaker teams with 3ST attack.
Arrows
I wouldn't suggest to use red arrows on offensive positions (ST, AM) and blue arrows on defenders because that is their task by default. You don't need to order your striker to join attack because he is attacker.
Red - Mostly used when player, usually winger, has open space in front of him (eg. when I have 4 wingers while opponent has only 2). Red arrows are useful when you use defensive oriented formation which needs stronger support in attack, for example 4141 + red arrows on fullbacks. This sometimes creates effect of offensive fullbacks like Marcelo.
You should not use red arrows on fullbacks when your opponent uses AML/R or when he has 3ST in front of your 3-4 defenders.
Blue - when I'm focused on defense or outnumbered in some part of pitch (eg. when I have 2MC+DMC in the middle while opponent has AMC+2MC+DMC, then I use blue arrows on MC's).
Blue arrows could also be used on attacking players when you play offensive formation in order to make them more active in defensive part of game, I mean to create Wayne Rooney's work ratio (attacker who is helps in defending too)
For example, I put blue arrows on 2 side strikers in 3ST formations. Sorry, but I don't like lazy strikers (as Balotelli) who spends most of his time walking around pitch.
I'll try to update this thread (basicly main post) from time to time if I remember something or find out something new.
If someone didn't understand certain part, feel free to ask for detailed explanation