Warrior General Games

Should i train speed until training plus SPs = 61 or should i do it till it reaches to 48 and could you please explain slow building a little more to me i get it but not fully.

Ideally you train until the bonus you get from leveling > your training SP. This is somewhat unrealistic for safeties with 5 primaries. You're likely pretty safe with the 61 plan.

and what should i do with the other primaries?

Bring up speed, then vision, then agility; I wouldn't stop at the 61 cap though...

Train speed until speed plus skill points is 48. If you wait until 61 you will be doing very inneficient training. Once speed plus skill points is 48 assign the point to speed, switch training to something else, and keep assigning points to speed until speed is at least 60 but you could go higher than 60.

When you switch training from speed to something else you should choose an attribute that you will bring to 60, most likely either agility or vision.

You can ask other people's opinions about how to spend your points but you should watch the games and determine for yourself how to spend the points. If you let everyone else determine how to spend your points you might as well let everyone build the players and pay for flex points as well and let them determine what team to play for and when to shop for equipment and which equipment you should buy.