I was going to post a similar thread but I lost my notes.
Anyway as far as forma goes, multiple forma on weapons and learning to mod correctly on your frame are more important.
The norm for tougher content will be a minimum of 2 forma up to a desirable 4 forma.
If you dislike the grindy aspect of Destiny then Warframe is not the game for you.
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I'm actively getting help and advice from senior members on the warframe site. So this information is fresh in my mind.