Here are 3 tips to help you manage your Twitter account.
This app enables you to delete ALL your Tweets. You may wonder why you would want to do that rather than just delete the account and create a new one. The main reason is that you lose your Tweet URL so if you set it up with your name, that's gone. You also lose all your followers etc. Using TwitWipe just removes the tweets but keeps everything else.
The process isn't instantaneous and may take a day or overnight so be patient.
44 Twitter Hashtags for Writers
This webpage explains hashtags for the novice and gives a list of the most popular ones used by authors.
This webpage defines hastags and also allows you to enter definitions.
This trio of tips will help you navigate the Tweet universe quickly and efficiently.