Assertiveness, an essential skill for self esteem

Understand that there is a difference between self-esteem and ego. You can have a big ego and low self-esteem. In fact many big egos are in reaction to having low self-esteem.
I used to be unable to take any criticism and would explode in anger (or stay quiet and just get drunk about it).
Those with higher self-esteem and lower egos are the ones looked upon as modest or humble. Don't think of it as being weak.
Carry yourself with dignity and respect, although these qualities are also supposedly 'manmade' qualities and not how our deity judges us. Remember the Golden Rule.
Best of luck to you.

No no no no no no no. Just no.

Assertiveness isn't some "white knight" where it has only good things. I actually made a post about the flaws of your statement but had the stupid login timer which wiped the post so I'll skip all that and boil it down to one simple matter.

Assertiveness is a tool to be used. And if it can be used it can (and will) be abused. A BULLY is assertive. A TYRANT is assertive. You point out the good but IGNORE the bad. Korea making nuke threats is assertive. Slapping someone in the face is assertive. Telling someone what they need as if it's your choice and not theirs is assertive (and potentially dangerous for someones sanity due to deciding for others).

You don't get to point out the pros and ignore the cons. I'm ASSERTIVE enough to point out the bad parts even if you're too afraid to do that. You speak of assertive but then you show you're one sided because you either fear or otherwise turn a blind eye to the other side of the fence.

Assert your dominance on someone if they are being a pain. But only if you see that they are making you uncomfortable on purpose

People have problems with assertivness especially towards people they like

Its difficult with being assertive. Some people can read it wrong as everyone is different.