need help remembering

is it normal to to spend two weeks on a lesson to make sure that I understand it.

is it okay that I take a little longer memorizing my lessons.I wont move on until I feel confident that I can remember each word.

I try to drill myself to get know most of it. Later lessons often reinforce points from earlier lessons. Also I like to review earlier lessons periodically. I guess whatever works for you is fine.

你们好！ The good thing about our lessons is that it gives you the freedom to take the lessons at your own pace. The fact that you are taking the lessons slowly will do you no harm and in actual fact, it will probably be more beneficial to you. Building a strong foundation when learning a second language is very important and means that you won't have to go back later on and correct bad habits, which is much harder to do than learning it properly from the start. I would say a good indication of whether you should move on or not is if you think you feel comfortable with the grammar and the vocab in the lesson. Keep up the good work! - Lin Ping

Is it important to learn the chinese characters at the same time I'm learning pinyin or is that too much to learn at once?

I would try to do the writing lessons in sequence and take the time to learn it. Learning hanzi helps one get a deeper understanding of the language. Also, signs in China are not written in pinyin, though they may have English beneath the hanzi.

你们好！ I would definitely learn the hanzi at the same time as the pinyin. It is important to remember that pinyin should be considered a means of communication but rather a guide to help people pronounce the characters. Although characters seem difficult to begin with, the more you learn, the easier it gets: so don't give up! Keep up the great work! - Lin Ping

I have to learn most of the characters I already learned the pinyin for on the app I started learning Chinese on, because with the app, it was hard to remember I had to learn the characters, and then have the pinyin help me. It is definitly (sorry I spelled that wrong) important to use the pinyin as a helper, not the whole thing.
I hope to talk with you again
Erubar