Designing is just great thing and demanding skills in digital era of development everyone want to build designing skills and lot of different opportunities are available for designers like Graphic Designs, Product Designs, UI/UX designs Mobile applications designs and etc... but the important thing is to used right tool for right designs. here are some free tools which I used for my personal projects for designing and development.
Adobe Xd is great tool for designing and development amazing libraries are available inside the adobe xd, you can also used it for various purpose Logo Designs, Product Designs , Web designs etc. get the XD from link
Figma is widely usable design platform its used for all type of designs and provide lot of supportive libraries and features like live application interface also Mobile interface available for users.
Justinmind is great tool for Realtime web designs and mobile application interface its completely amazing experience with JUSTINMIND is great tools for Web Designers.